History Series / SomedayOrOneDay

* BodySnatcher: It's involuntary and non-malicious, but the real Chen Yun Ru [[spoiler: and Wang Quan Sheng]] are effectively helpless while the MentalTimeTravel is in effect.

** [[spoiler: Zhi Qi, in Zhong Ru's body, talks to his younger self and encourages his [[InsaneEqualsViolent unstable tendencies.]]]]

* BigBad: [[spoiler: PsychoPsychologist Xie Zhi Qi]] is directly responsible for [[spoiler: murdering Cai Wen Rou, attacks Yun Ru with intent to kill, and is the only major character to be depicted negatively.]]

* AgeGapRomance: [[spoiler: Zi Wei and Yu Xuan have a 12 year age difference without getting into the time travel shenanigans.]]
* AgentScully: [[spoiler: Jun Jie only pretends to believe [[MentalTimeTravel Yu Xuan's claims that she is a person from the future]], thinking that Yun Ru made the entire thing up and changed her personality just to make Zi Wei like her up [[SkepticNoLonger until halfway through the final episode.]]]]
* AlasPoorVillain: [[spoiler: Cai Wen Rou is jealous of Yu Xuan/Yun Ru since Zi Wei likes her and plasters pictures of her changing for gym class on the school bulletin board, but her death at Zhong Ru's hands is played for all its terrifying potential.]]
* AnguishedDeclarationOfLove: Jun Jie [[spoiler: does this in his attempt of TalkingDownTheSuicidal Yun Ru, when she is convinced no one cares about the real Yun Ru, only Yu Xuan.]]
* AttentionWhore: Not in the usual way. [[spoiler: Yun Ru has never gone through with a suicide attempt since everyone would think her pitiful and forget her. But after she sees how popular she became when Yu Xuan controlled her and [[IJustWantToBeLoved Zi Wei return her feelings]] (even if he was really in love with Yu Xuan), she decides to go through with it, assured at that point that more people would react differently.]]
* BadPeopleAbuseAnimals: [[spoiler: Zhi Qi's mom mentions that he killed a cat when talking to Zhong Ru about his disturbing lack of remorse when being punished.]]
* BigBad: [[spoiler: PsychoPsychologist Xie Zhi Qi is directly responsible for murdering Cai Wen Rou, attacks Yun Ru with intent to kill, and is the only major character to be depicted negatively.]]
* BittersweetEnding: [[spoiler: Xie Zhong Ru/Xie Zhi Qi is stopped from causing harm, but once this is done Li Zi Wei, Huang Yu Xuan, Mo Jun Jie, Chen Yun Ru, and many others give up their memories of the series' events. The Zi Wei and Yu Xuan that time traveled end up being RetGone, though there is the possibility of Yu Xuan the little girl and Zi Wei the high schooler from meeting each other after growing up.]]

* {{Bowdlerise}}: The Mainland Chinese broadcast excised all scenes related to sexuality [[spoiler: such as the real Quan Sheng's entire backstory and the ADateWithRosiePalms scene]] and censored elements that showed Taiwan as an independent country (like flags and identification documents).

* CosmicRetcon: [[spoiler: By breaking the casette of Wu Bai's "The End of Love" in the past, this means that Zhi Qi is unable to go back in time, therefore preventing Yun Ru, Jun Jie, Zi Wei, and presumably Wen Rou's deaths. However, this means that no MentalTimeTravel happens, and Quan Sheng and Yu Xuan never meet (and Quan Sheng [[AmbiguousSituation may have actually died]]). Everyone loses all their memories of the story's events and the Yu Xuan and Zi Wei that engaged in time traveling are RetGone.]]

* ADateWithRosiePalms: [[spoiler: Zhi Qi, in his brother's body, does this while looking at pictures of Yun Ru.]]
* DeadHandShot: [[spoiler: After Li Zi Wei's car accident, the camera shows his hand dangling out of the car before panning to the Walkman on the ground. However, it turns out he isn't actually dead.]]
* DeathOfPersonality: Unlike Chen Yun Ru whose soul is explicitly shown as stuck inside her body, [[spoiler: the absense of such scenes for Quan Sheng may mean that the real one is effectively dead once Zi Wei takes over.]]
* DidNotGetTheGirl: [[spoiler: Ultimately, Huang Yu Xuan and Li Zi Wei don't get together by the series' end in order to stop Xie Zhi Qi/Xie Zhong Ru, though there is the possibility that they'll find each other again.]]
* DisabledLoveInterest: Mo Jun Jie, who has impaired hearing, has a crush on Chen Yun Ru and the promotional material sets him up as a competitor against Li Zi Wei. In the series, he confesses to her early on but she doesn't reciprocate, and he doesn't fall for Huang Yu Xuan in Yun Ru's body. [[spoiler: Though it is ZigZagged with the MaybeEverAfter he gets with Yun Ru in the ending.]]
* DisappearedDad: Yun Ru's father shows up once after she is released from the hospital. Due to the divorce proceedings, he never shows up in the narrative again even during situations when it would make sense [[spoiler: like visiting her grave, which her mom and brother do.]]

* FatBestFriend: Yu Xuan's best friend (who is also the only overweight character in the series) is an outgoing GenkiGirl, who gives Yu Xuan some leads early on but is largely non-essential to the plot.

** [[spoiler: When Yun Ru regains control of her body and shuts Yu Xuan out, the latter attempts this by questioning her about her motives and pointing out that what she is doing won't prevent the deaths of herself and the people she knew in the future. It doesn't work.]]

* IdentityBreakdown: The [[spoiler: real Yun Ru, upon seeing how popular she becomes when Yu Xuan is possessing her, and that her crush Zi Wei adores Yu Xuan, decides to take on that personality, since by her reasoning they only care about Yu Xuan. Sadly it doesn't work as the people around her note that she acts like a different person and Zi Wei is turned off and suspects that Yun Ru has returned to her body. Both express that the way she was before (when Yu Xuan was possessing her) was much preferable to the real Yun Ru. This is a major factor leading to Yun Ru's death.]]

* MaybeEverAfter: The ending conveniently [[spoiler: takes Li Zi Wei out of the equation in the Chen Yun Ru - Mo Jun Jie - Li Zi Wei LoveTriangle]] and makes the remaining two people friendlier though doesn't definitively confirm any romantic feelings on [[spoiler: Chen Yun Ru's part]].

** In the final episode: [[spoiler: Yu Xuan takes the casette out of the broken Walkman and puts it in the car player while thinking of Zi Wei, travelling back to Yun Ru's body by accident.]]
* MiscarriageOfJustice: [[spoiler: Jun Jie goes to prison for Yun Ru's murder (really a suicide).]]

* ReadingLips: Jun Jie does this in the final episode [[spoiler: When observing Yun Ru talk to herself (really talking to Yu Xuan trapped in her body).]]

** Xie [[spoiler: Zhi Qi is the [[FamilialBodySnatcher one behind Zhong Ru's actions.]]]]

* StalkerWithACrush: Zhong Ru[[spoiler:/Zhi Qi]] is unhealthily obsessed with Yun Ru, acquiring photos of her, [[spoiler: masturbating to them, and fantasizing about Yun Ru saying she wants him.]]

* TalkingDownTheSuicidal: [[spoiler: Jun Jie and Yu Xuan [[FightingFromTheInside trapped in Yun Ru's body]] attempt to calm Yun Ru down.]]

* TimeSkip: Discounting the time travel related ones, [[spoiler: time passes from 2019 to 2020 after the Walkman breaks.]]

* UncannyFamilyResemblance: [[spoiler: Xie Zhong Ru and Xie Zhi Qi ([[ActingForTwo who are both played by the same actor]]) are brothers (with a 6 year age difference), though they look similar enough that one is mistaken for the other.]]
* UncertainDoom: [[spoiler: Quan Sheng attempts suicide, but thanks to Zi Wei's consciousness entering his body, his body survives but no mention is made of his soul remaining trapped in the body afterwards unlike the explicit scenes of Yun Ru and Zhong Ru being trapped inside when other people are in their body, possibly indicating that his consciousness is no longer present. In the final episode when the ResetButton is pushed, no mention is made of what happened to him.]]
* VictoryGuidedAmnesia: [[spoiler: The steps Zi Wei, Yu Xuan, and Jun Jie take to SetRightWhatOnceWentWrong involve a CosmicRetcon, therefore eliminating all memories of the series' events from .]]

* AssholeVictim: [[spoiler: Cai Wen Rou is jealous of Yu Xuan/Yun Ru since Zi Wei likes her and plasters pictures of her changing for gym class on the school bulletin board, but her death at Zhong Ru's hands is played for all its terrifying potential.]]

[[caption-width-right:350:[[{{Tagline}} The Mystery of Love]][[note]]from bottom to top: Chen Yan Ru, Li Zi Wei, Mo Jun Jie[[/note]]]]

In 1998, Chen Yan Ru is a shy high school student crushing on Li Zi Wei, while Zi Wei's best friend Mo Jun Jie (Patrick Shih) nurses his own feelings for her. One night, while walking during a bad day, the last thing she sees is a car heading towards her...

Yu Xuan wakes up in the hospital, overjoyed to see her boyfriend again, but is shocked to discover that he is not Wang Quan Sheng, but Li Zi Wei, and that he calls her Chen Yan Ru, not Huang Yu Xuan. She must learn to navigate her new life, while figuring out why she traveled back in time, the mystery of Quan Sheng and Zi Wei's identical appearances, and what really landed Yan Ru in the hospital to begin with.

* AgentScully: [[spoiler: Jun Jie only pretends to believe [[MentalTimeTravel Yu Xuan's claims that she is a person from the future]], thinking that Yan Ru made the entire thing up and changed her personality just to make Zi Wei like her up [[SkepticNoLonger until halfway through the final episode.]]]]

* AssholeVictim: [[spoiler: Cai Wen Rou is jealous of Yu Xuan/Yan Ru since Zi Wei likes her and plasters pictures of her changing for gym class on the school bulletin board, but her death at Zhong Ru's hands is played for all its terrifying potential.]]
* AttentionWhore: Not in the usual way. [[spoiler: Yan Ru has never gone through with a suicide attempt since everyone would think her pitiful and forget her. But after she sees how popular she became when Yu Xuan controlled her and [[IJustWantToBeLoved Zi Wei return her feelings]] (even if he was really in love with Yu Xuan), she decides to go through with it, assured at that point that more people would react differently.]]

* BittersweetEnding: [[spoiler: Xie Zhong Ru/Xie Zhi Qi is stopped from causing harm, but once this is done Li Zi Wei, Huang Yu Xuan, Mo Jun Jie, Chen Yan Ru, and many others give up their memories of the series' events. The Zi Wei and Yu Xuan that time traveled end up being RetGone, though there is the possibility of Yu Xuan the little girl and Zi Wei the high schooler from meeting each other after growing up.]]
* BodySnatcher: It's involuntary and non-malicious, but the real Chen Yan Ru [[spoiler: and Wang Quan Sheng]] are effectively helpless while the MentalTimeTravel is in effect.

* ChekhovsGunman: Remember [[spoiler: that psychologist who shows up once]] in an early episode? [[spoiler: He's related to the guy who is unhealthily obsessed with Yan Ru and may have murdered her. And he's also the BigBad responsible for killing three people.]]
* CoolUncle: Chen Yan Ru's uncle encourages her, acts concerned for her welfare, and takes the reveal of Yu Xuan possessing her well, to the point where he acts like a better father figure to her than her actual father.
* CosmicRetcon: [[spoiler: By breaking the casette of Wu Bai's "The End of Love" in the past, this means that Zhi Qi is unable to go back in time, therefore preventing Yan Ru, Jun Jie, Zi Wei, and presumably Wen Rou's deaths. However, this means that no MentalTimeTravel happens, and Quan Sheng and Yu Xuan never meet (and Quan Sheng [[AmbiguousSituation may have actually died]]). Everyone loses all their memories of the story's events and the Yu Xuan and Zi Wei that engaged in time traveling are RetGone.]]
* DarkestHour: In the last few episodes, [[spoiler: Zhi Qi is intent on killing Yan Ru, has killed the present Zi Wei, and breaks the Walkman to prevent the heroes time traveling. Yun Ru has a crisis of identity, and the repaired-but-barely-working Walkman runs out of its final play as Yu Xuan fails to change or prevent anything.]]
* ADateWithRosiePalms: [[spoiler: Zhi Qi, in his brother's body, does this while looking at pictures of Yan Ru.]]

* DisabledLoveInterest: Mo Jun Jie, who has impaired hearing, has a crush on Chen Yan Ru and the promotional material sets him up as a competitor against Li Zi Wei. In the series, he confesses to her early on but she doesn't reciprocate, and he doesn't fall for Huang Yu Xuan in Yan Ru's body. [[spoiler: Though it is ZigZagged with the MaybeEverAfter he gets with Yan Ru in the ending.]]
* DisappearedDad: Yan Ru's father shows up once after she is released from the hospital. Due to the divorce proceedings, he never shows up in the narrative again even during situations when it would make sense [[spoiler: like visiting her grave, which her mom and brother do.]]

* IdenticalStranger: Wang Quan Sheng and Li Zi Wei look the exact same despite the age difference. Slightly downplayed with Chen Yan Ru and Huang Yu Xuan as they style their hair differently though their identical appearances are remarked on in-universe.
* IdentityBreakdown: The [[spoiler: real Yan Ru, upon seeing how popular she becomes when Yu Xuan is possessing her, and that her crush Zi Wei adores Yu Xuan, decides to take on that personality, since by her reasoning they only care about Yu Xuan. Sadly it doesn't work as the people around her note that she acts like a different person and Zi Wei is turned off and suspects that Yan Ru has returned to her body. Both express that the way she was before (when Yu Xuan was possessing her) was much preferable to the real Yan Ru. This is a major factor leading to Yan Ru's death.]]

* KnightOfCerebus: Xie Zhong Ru is set up as [[spoiler: Chen Yan Ru's potential murderer]] and after his appearance the tone of future episodes gets darker and darker.
* LoveTriangle: Mo Jun Jie likes Chen Yan Ru, who likes Li Zi Wei. When Huang Yu Xuan is in her body, it turns into a TwoPersonLoveTriangle as Li Zi Wei falls for her and Mo Jun Jie is slowly turned off.
* MaybeEverAfter: The ending conveniently [[spoiler: takes Li Zi Wei out of the equation in the (real) Chen Yan Ru - Mo Jun Jie - Li Zi Wei LoveTriangle]] and makes the remaining two people friendlier though doesn't definitively confirm any romantic feelings on [[spoiler: Chen Yan Ru's part]].
* MentalTimeTravel: By listening to an old Walkman that plays Wu Bai's "Last Dance," Huang Yu Xuan's consciousness goes from 2019 to 1998, and lands her in Chen Yan Ru's body. [[spoiler: Li Zi Wei's consciousness goes from 2003 to 2010 and lands him in Wang Quan Sheng's body in the same manner, and he travels from 2017 back to 2003 in the plane accident.]] Time still passes in the 'base' times and the bodies left behind are left in a vegetative state. [[spoiler: Though when Xie Zhi Qi uses the Walkman, he is able to be woken up by outside stimulus.]]
** In the final episode: [[spoiler: Yu Xuan takes the casette out of the broken Walkman and puts it in the car player while thinking of Zi Wei, travelling back to Yan Ru's body by accident.]]

* PsychoPsychologist: [[spoiler: Zhi Qi is Yu Xuan's psychiatrist and the one behind the murder attempt on Yan Ru.]]

** The first hint that Xie Zhong Ru [[spoiler: who is really Xie Zhi Qi]] is off are his sinister smiles [[StalkerWithACrush when looking at and hearing about Chen Yan Ru.]] Later on it turns into outright SlasherSmile territory [[spoiler: when he's attacking with intent to kill.]]
** [[spoiler: The real Yan Ru]] has a creepy TechnicallyASmile when [[spoiler: she regains control of her body, her IdentityBreakdown imminent.]]

** Furthermore, [[spoiler: Zhi Qi in Zhong Ru's body influences the Zhi Qi of the past by encouraging his budding sociopathic tendencies and obsession with Yan Ru and having him witness Wen Rou's murder.]]
* StalkerWithACrush: Zhong Ru[[spoiler:/Zhi Qi]] is unhealthily obsessed with Yan Ru, acquiring photos of her, [[spoiler: masturbating to them, and fantasizing about Yan Ru saying she wants him.]]

* SuicideByCop: [[spoiler: Yan Ru in her IdentityBreakdown doesn't try to avoid Zhi Qi following her and offers no resistance when he tries to murder her. When Zhi Qi is interrupted by the police capturing his body in 2019, she tries to get Zhong Ru and later Jun Jie to kill her. When they refuse, she takes matters into her own hands.]]

* TalkingDownTheSuicidal: [[spoiler: Jun Jie and Yu Xuan [[FightingFromTheInside trapped in Yan Ru's body]] attempt to calm Yan Ru down.]]

* TwoPersonLoveTriangle: Over time, Li Zi Wei gets closer to Huang Yu Xuan in Chen Yan Ru's body, though Yu Xuan initially doesn't want to start anything so not to mess up Yan Ru's relationships.

** Episode 10 [[spoiler: reunites the older Li Zi Wei and Huang Yu Xuan, reveals that the nature of time travel is a StableTimeLoop, [[ChekhovsGunman brings back the psychologist Xie Zhi Qi]], who reveals that Xie Zhong Ru is his older brother, and later has Zhi Qi attack Yu Xuan in her home. Zhi Qi travels back in time, ending up in Zhong Ru's body, from which we see him attempt to murder Yan Ru and kill the Zi Wei in the present time.]]

* BittersweetEnding: [[spoiler: Xie Zhong Ru/Xie Zhi Qi is stopped from causing harm, but once this is done Li Zi Wei, Huang Yu Xuan, Mo Jun Jie, Chen Yan Ru, and many others give up their memories of the series' events. The Zi Wei and Yu Xuan that time traveled end up being RetGone.]]

* BittersweetEnding: [[spoiler: Xie Zhong Ru/Xie Zhi Qi is stopped from causing harm, but in order to do this Li Zi Wei and Huang Yu Xuan must give up their memories of each other, though there's nothing preventing them from finding each other again by chance.]]

* InterruptedSuicide: [[spoiler: Jun Jie attempts to stop Yun Ru from committing suicide. Initially he fails but in Yu Xuan's last ditch effort to travel back in time to Yun Ru's body he pulls her back.]]

* ResetButton: [[spoiler: By breaking the casette of Wu Bai's "The End of Love" in the past, this means that Zhi Qi is unable to go back in time, therefore preventing Yan Ru, Jun Jie, Zi Wei, and presumably Wen Rou's deaths. However, this means that no MentalTimeTravel happens, Quan Sheng and Yu Xuan never meet (and Quan Sheng [[AmbiguousSituation may have actually died]]), therefore Zi Wei and Yu Xuan lose all their memories of each other and the series events.]]

* RippleEffectProofMemory: [[spoiler: The time travelers retain their memories of what happened in the loop. Though by the ending, [[ResetButton this is no longer the case.]]]]

* WistfulAmnesia: In the final episode, [[spoiler: Zi Wei and Yu Xuan both get the feeling they have forgotten someone important to them.]]

* AgentScully: [[spoiler: Jun Jie only pretends to believe [[MentalTimeTravel Yu Xuan's claims that she is a person from the future]], thinking that Yan Ru made the entire thing up and changed her personality just to make Zi Wei like her.]]

* ResetButton: [[spoiler: By breaking the Sony Walkman in the past, this means that Zhi Qi is unable to go back in time, therefore preventing Yan Ru, Jun Jie, Zi Wei, and presumably Wen Rou's deaths. However, this means that no MentalTimeTravel happens, Quan Sheng and Yu Xuan never meet (and Quan Sheng [[AmbiguousSituation may have actually died]]), therefore Zi Wei and Yu Xuan lose all their memories of each other and the series events.]]

* AgeGapRomance: [[spoiler: Li Zi Wei and Huang Yu Xuan have a 12 year age difference without getting into the time travel shenanigans.]]

* CoolUncle: Chen Yan Ru's uncle encourages her, acts concerned for her welfare, and [[spoiler: initially]] takes the reveal of Yu Xuan possessing her well, to the point where he acts like a better father figure to her than her actual father.

* DrivenToMadness: Being unable to control a body while someone else is controlling it [[spoiler: does quite a number to Zhong Ru's sanity, though he has a full-on FreakOut when he [[IdenticalStranger sees Yu Xuan's face]] while she is interrogating him.]]
* DrivenToSuicide: After his [[spoiler: release from prison, Mo Jun Jie commits suicide at the scene of Chen Yun Ru's death out of guilt.]]

* FightingFromTheInside: [[spoiler: Zhong Ru attempts to resist Zhi Qi (who is inhabiting his body) from murdering Yun Ru.]]
* {{Gayngst}}: [[spoiler: The real Wang Quan Sheng faced homophobic bullying from his peers and his crush when confessing his feelings goes wrong.]]
* GayngstInducedSuicide: [[spoiler: The real Quan Sheng walks into the sea after his crush rejects him and participates in homophobic bullying, although he survives but gets his body taken over by Zi Wei.]]

* IdentityBreakdown: [[spoiler: The real Yan Ru, upon seeing how popular she becomes when Yu Xuan is possessing her, and that her crush Zi Wei adores Yu Xuan, decides to take on that personality, since by her reasoning they only care about Yu Xuan. Sadly it doesn't work as the people around her note that she acts like a different person, fueling the events of her death.]]

* PsychoticSmirk: The first hint that Xie Zhong Ru [[spoiler: who is really Xie Zhi Qi]] is off are his sinister smiles [[StalkerWithACrush when looking at and hearing about Chen Yan Ru.]] Later on it turns into outright SlasherSmile territory [[spoiler: when he's attacking with intent to kill.]]
** [[spoiler: The real Yan Ru has a creepy TechnicallyASmile when she regains control of her body, her IdentityBreakdown imminent.]]

* SuicideByCop: [[spoiler: After Zhi Qi fails to murder her, Yun Ru gets Jun Jie to kill her.]]

* UncertainDoom: [[spoiler: Quan Sheng attempts suicide, but thanks to Zi Wei's consciousness entering his body, his body survives but no mention is made of his soul remaining trapped in the body afterwards unlike Yu Xuan in Yun Ru's body, possibly indicating that his consciousness is no longer present. In the final episode when the ResetButton is pushed, no mention is made of what happened to him.]]

* BittersweetEnding: [[spoiler: Xie Zhong Ru/Xie Zhi Qi is stopped from causing harm to both timelines, but in order to do this Li Zi Wei and Huang Yu Xuan must give up their memories of each other, though there's nothing preventing them from finding each other again by chance.]]

* RippleEffectProofMemory: [[spoiler: The time travelers retain their memories of what happened in their original timelines. Though by the ending, [[ResetButton this is no longer the case.]]]]

* {{Bowdlerise}}: The Mainland Chinese broadcast excised all scenes relating to homosexuality and censored elements that showed Taiwan as an independent country (such as identification documents).

Yu Xuan wakes up in the hospital, overjoyed to see her boyfriend again, but is shocked to discover that he is not Wang Quan Sheng, but Li Zi Wei, and that he calls her Chen Yan Ru, not Huang Yu Xuan. She must learn to navigate her new life, while figuring out why she traveled back in time, the mystery of Wang Quan Sheng and Li Zi Wei's identical appearances, and what really landed Chen Yan Ru in the hospital to begin with.

* BuryYourGays: [[spoiler: Quan Sheng attempts suicide, but thanks to Zi Wei's consciousness entering his body, he survives but no mention is made of his soul remaining trapped in the body afterwards unlike Yu Xuan in Yun Ru's body. Additionally, Quan Sheng's body is lost in the plane crash (Zi Wei's mind travels back in time) making him one of the few people in the series to stay dead.]]

* DrivenToSuicide: After his [[spoiler: release from prison. Mo Jun Jie commits suicide at the scene of Chen Yun Ru's death out of guilt.]]

* RippleEffectProofMemory: [[spoiler: The time travelers retain their memories of what happened in their original timelines.]]

** Furthermore, [[spoiler: Zhi Qi in Zhong Ru's body influences the Zhi Qi of the past ]]
* StalkerWithACrush: Zhong Ru [[spoiler: and Zhi Qi]] is unhealthily obsessed with Yan Ru, acquiring photos of her, [[spoiler: masturbating to them, and fantasizing about Yan Ru saying she wants him.]]

* TimePassageBeard: After [[spoiler: Jun Jie is released from prison, several years after 1998, we see him with a mustache and goatee.]]

* BittersweetEnding: [[spoiler: Xie Zhong Ru is stopped from causing harm to both timelines, but in order to do this Li Zi Wei and Huang Yu Xuan must give up their memories of each other, though there's nothing preventing them from finding each other again by chance.]]
* BodySnatcher: It's involuntary and non-malicious, but the original Chen Yan Ru [[spoiler: and Wang Quan Sheng]] are effectively helpless while the MentalTimeTravel is in effect.

* BuryYourGays: [[spoiler: The original Wang Quan Sheng's consciousness and body are lost forever in the plane crash, making him one of the few people in the series to stay dead.]]
* ChekhovsGunman: Remember [[spoiler: that psychologist who shows up once]] in an early episode? [[spoiler: Turns out he's the brother of the guy who murdered a student and is happy to keep murdering people.]]

* FamilialBodySnatcher: [[spoiler: Xie Zhong Ru's consciousness travels from 1998 to 2019, to his brother Xie Zhi Qi's body.]]
* {{Gayngst}}: [[spoiler: The original Wang Quan Sheng faced homophobic bullying from his peers and his crush when confessing his feelings goes wrong.]]
* GayngstInducedSuicide: [[spoiler: The original Wang Quan Sheng walks into the sea after his crush rejects him and participates in homophobic bullying, although he survives but gets his body taken over by Li Zi Wei.]]

* MaybeEverAfter: The ending conveniently [[spoiler: takes Li Zi Wei out of the equation in the (original) Chen Yan Ru - Mo Jun Jie - Li Zi Wei LoveTriangle]] and makes the remaining two people friendlier though doesn't definitively confirm any romantic feelings on [[spoiler: Chen Yan Ru's part]].

* MentalTimeTravel: Huang Yu Xuan's consciousness goes from 2019 to 1998, and lands her in Chen Yan Ru's body. [[spoiler: Li Zi Wei's consciousness goes from 2003 to 2010 and lands him in Wang Quan Sheng's body, and he travels from 2017 back to 2003 in the plane accident.]] Time still passes in the 'base' times and the bodies left behind are left in a vegetative state.

* WhamLine: In episode 6, Li Zi Wei (and by extension, the audience) learns who a seemingly minor character really is:
-->'''Little Girl''': Big brother! [[spoiler: I'm called Huang Yu Xuan!]] You can't forget me, okay?
* WistfulAmnesia: In the final episode, [[spoiler: Li Zi Wei and Huang Yu Xuan both get the feeling they have forgotten someone important to them.]]

* MentalTimeTravel: Huang Yu Xuan's consciousness goes from 2019 to 1998, and lands her in Chen Yan Ru's body. [[spoiler: Li Zi Wei's consciousness goes from 2003 to 2010 and lands him in Wang Quan Sheng's body, and he travels from 2017 back to 2003 in the plane accident.]] Time still passes in the 'base' times.

* AgeGapRomance: [[spoiler: Not with Li Zi Wei and Chen Yan Ru where they're in the same age group, but with Li Zi Wei and Huang Yu Xuan, who have at least a 10 year age difference without getting into the time travel shenanigans.]]

* TimePassageBeard: After [[spoiler: Jun Jie is released from prison, we see him with a mustache and goatee.]]

* AgeGapRomance: [[spoiler: Not with Li Zi Wei and Chen Yan Ru or Wang Quan Sheng and Huang Yu Xuan, where both couples are the same age, but with Li Zi Wei and Huang Yu Xuan, who have at least a 10 year age difference without getting into the time travel shenanigans.]]

''Someday or One Day'' (Original title: ''想見你'', translation: ''Want to See You'') is a 2019 Taiwanese TimeTravelRomance series starring Alice Ke, Greg Hsu, and Patrick Shih.

* MentalTimeTravel: Huang Yu Xuan's consciousness goes from 2019 to 1998, and lands her in Chen Yan Ru's body. [[spoiler: Li Zi Wei's consciousness goes from 2003 to 2010 and lands him in Wang Quan Sheng's body.]] Time still passes in the 'base' times.

* BittersweetEnding: [[spoiler: Xie Zhong Ru is stopped from causing harm to both timelines, but in order to do this Li Zi Wei and Huang Yu Xuan must give up their memories of each other.]]

* DeadHandShot: [[spoiler: After Li Zi Wei's car accident, the camera shows his hand dangling out of the car before panning to the Walkman on the ground. Later it's subverted when it turns out he isn't actually dead.]]
* DidNotGetTheGirl: [[spoiler: Ultimately, Huang Yu Xuan and Li Zi Wei don't get together by the series' end in order to stop Xie Zhi Qi/Xie Zhong Ru.]]
* DisabledLoveInterest: Subverted. Mo Jun Jie, who has impaired hearing, has a crush on Chen Yan Ru and the promotional material sets him up as a competitor against Li Zi Wei. In the series, he confesses to her early on but she doesn't reciprocate, and he doesn't fall for Huang Yu Xuan in Yan Ru's body. [[spoiler: Then it's PlayedWith the MaybeEverAfter he gets with Yan Ru]]

* KnightOfCerebus: Xie Zhong Ru is set up as [[spoiler: Chen Yan Ru's potential murderer]] and it's his appearance that sets up the darker tones of the next episodes.
* MaybeEverAfter: The ending conveniently [[spoiler: takes Li Zi Wei out of the equation in the (original) Chen Yan Ru - Mo Jun Jie - Li Zi Wei LoveTriangle]] and makes the remaining two people friendlier though doesn't definitively confirm any feelings on [[spoiler: Chen Yan Ru's part]].

* DisabledLoveInterest: Subverted. Mo Jun Jie, who has impaired hearing, has a crush on Chen Yan Ru and the promotional material sets him up as a competitor against Li Zi Wei. In the series, he confesses to her early on but she doesn't reciprocate, and he doesn't fall for Huang Yu Xuan in Yan Ru's body.

* Bowdlerise: The Mainland Chinese broadcast excised all scenes relating to homosexuality and censored elements that showed Taiwan as an independent country (such as identification documents).