Characters from Yumi's Cells. Since this is a completed work with Self-Fulfilling Spoilers, spoilers are off.
(This page has been moved to Yumi's Cells)
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Yumi and her Cells
Yumi Kim
Yumi Kim
- Amicable Exes: She and Woong reach a point at which they can congratulate each other on their life achievements. She doesn't get to that point with her other exes.
- Big Eater: Her largest cell, Hunger Cell, has a huge influence on her. Thus she frequently makes decisions based on food and eats massive quantities of it.
- Clingy Jealous Girl: She doesn't like it when her boyfriend looks at other women, to the point that "being attracted to another girl for even a second" is a major turn-off for her.
- Covert Pervert: Despite her meek and shy personality, Yumi has an active Naughty Cell that has to be kept in check by the others.
- Emotion Suppression: She keeps her Inner Feelings cell locked up deep in her mind so that it won't blab about something that could compromise her relationships with others.
- Expository Hairstyle Change: After the Cells free Silkie from the Bobites, Yumi starts growing her hair out. She cuts her hair during important events like becoming a published author.
- Hopeless Suitor: Towards Wook. When she finds out he's not interested in her, or girls in general, a storm breaks out in her mind.
- Hysterical Woman: One of Yumi's recurring cells is Hysterius, a mischievous boy who wants to make Yumi release all of her pent-up frustration. Hysterius cells also exist in other people, but it's only consistently been Yumi with one to stir up trouble.
- Informed Ability: Yumi is said to be a great writer. While we do learn that she loses a few contests and eventually writes a popular web novel, we don't get many actual looks into her writing style and can only glean from what the others tell the audience.
- Loners Are Freaks: Yumi's still single partly because she avoids social activities such as going out drinking with her coworkers.
- Never My Fault: Yumi's Judge Cell embodies this part of her personality, constantly insisting that other people are at fault whenever she suffers from relationship problems.
- Oblivious to Love: Yumi is the subject of at last three unnoticed crushes: a boy she knew in college (who grows up to be her chief editor), with her boss at the office, and with Babi.
- Properly Paranoid: She was right to be concerned in the two times another girl caused a strain on her relationship. Sia's mixed signals were actually an attempt to drive apart Yumi and Woong, and Babi was getting swayed by a mutual crush on his part-timer Da-eun.
- Shrinking Violet: Yumi struggles to speak her mind and stand up for herself. After she starts going out with Woong, she does become more confident eventually.
- Significant Wardrobe Shift: Yumi's Fashion Cell is freed from prison when Yumi tries to win over Wook and starts putting more effort into her appearance. After Yumi's first break-up with Babi, Fashion Cell morphs into a Fashion Terrorist and makes Yumi dress very casually and comfortably.
- Super Mode: In Chapter 121, she enters "Ultra-Yumi Mode" when her self-esteem levels go up over 3,000.
- Trademark Favorite Food: Yumi's favorite food is tteokbokki, which is her profile picture and the food on Hunger Cell's antenna.
- Weight Woe: Yumi is conscious about the Fat that lives in her sides, but her Diet Cell has a soft spot for Hunger Cell and doesn't do anything about her food intake.
Love Cell
Love Cell
- Badass Cape: As the most powerful Cell, she wears a pink one to distinguish her from the other Cells.
- Became Their Own Antithesis: When Yumi attempts to break up with Babi, his words sway Love Cell into giving him another chance. This makes Yumi so upset with her own (and Love Cell's) indecisiveness that she turns Love Cell into Anger Incarnate, which makes it impossible to date Babi anymore.
- Brought Down to Normal: After being demoted from Prime Cell, she's unable to use her skills. She's even wearing the regular blue suit during this time.
- Earned Stripes: She has a distinctive pink outfit that marks her as a Prime Cell with special abilities. She loses it when she is demoted.
- The First Cut Is the Deepest: Starts out in a coma, barring Yumi from entering any relationships, because Yumi's last relationship was abusive.
- The Power of Love: Love Cell is so powerful that she can check the Cells that cause harm to Yumi, including Hunger Cell, the source of Yumi's untameable appetite.
Hunger Cell
Hunger Cell
- Big Eater: His defining characteristic. When the Cells need to ration their food, he takes the largest portion. When everyone's fighting over what Yumi should do, he can just push them out of the way and take control of her.
- The Big Guy: As the largest Cell in Yumi's village, he can brute force decisions that other Cells struggle to make.
- De-power: In Chapter 51, he loses his will to eat when his appetite antenna is torn out.
- Manchild: He's a giant building-sized child that is constantly snacking. The others try to keep him under control so Yumi doesn't overeat, but he can get very cranky.
Naughty Cell
Naughty Cell
- Lovable Sex Maniac: He runs wild with the naughty thoughts and has to be kept in check by other Cells, hence Yumi's covert pervertedness. However, his actions are usually comedic and occasionally useful in Yumi's romantic endeavors.
- Naked People Are Funny: As a probationary Cell, he actually never wore pants. All his front-facing panels were censored in various comedic ways.
- No Sense of Personal Space: When Soonrok's Love Cell walks near him, he goes straight for The Glomp, embarrassing everyone in the town. This corresponds to an Accidental Hand-Hold.
- Sir Swears-a-Lot: He has the most censored lines out of all of the cast, mostly to do with naughty acts.
Writer Cell
Writer Cell
- Back from the Dead: He rises from the grave and uses an imagination skill to get Yumi to go to Woong after they fight.
- Badass Cape: Once he is promoted to Prime Cell, he gets a cape to complement his new powers.
- Earned Stripes: When he becomes Prime Cell, he gains a green Shakespearian outfit to mark his promotion.
- Posthumous Character: He's dead at the beginning of the story due to disuse.
Yumi's Love Interests
Wook
Wook
- But Not Too Gay: While he comes out to Yumi very early into the series and has his own love interest, Wook is usually playing off of Woong (his buddy) or Ruby (his most persistent admirer). His love interest is unnamed and doesn't show up until Chapter 504 for a single panel.
- Incompatible Orientation: Neither Yumi nor Ruby has a chance with him because he is interested in a guy.
- Significant Name Overlap: He has the same name as Yumi's ex-boyfriend, and it's likely the reason she fixates on him at first—even internally regarding him as her "destiny" until she decides to give Woong a chance.
- Straight Gay: He's an ordinary office worker who gives sensible advice to Woong and tries to gently let down suitors who aren't interested in him. If he hadn't admitted to Yumi that he's not into girls, it wouldn't be obvious that he is gay. In fact, Ruby might not have figured it out since she kept chasing him for three years.
Woong Ku
Woong Ku
- False Soulmate: Yumi believes he's her destiny and has to be told by the bulletin board manager that there is no male main character in her life.
- Manchild: Yumi's Cells describe him specifically as a "sloppy, self-centered person with a boyish heart".
- Oblivious to Love: Woong didn't know how Sia felt about him for the longest time, since she constantly hid her feelings around him and when she actually flirted he didn't know what she was going for.
- Punny Name: His given name is a casual way of saying "yes". Yumi weaponizes this to make him deliver a Blunt "Yes" to Sia.
- Royal Brat: Chapter 58 introduces Woong's King Pouty, in which it takes him three years to leave once he settles somewhere.
- Second Love: After Yumi went through a break-up and became emotionally withdrawn, she was able to open her heart to Woong.
Babi Yoo
Babi Yoo
- Chick Magnet: He has attracted many women over the course of the series, including Eda, Yumi, Yunhee, and Da-eun. Yumi kept her guard up while she and Babi were both in separate relationships, but she fell for him after they both became single.
- Emotion Suppression: His Overreacting Cell tends to make him too kind in situations that could be terribly misinterpreted. Thus he keeps it locked up, forcing himself not to overstep his bounds.
- Oblivious to Love: When Babi was in high school, he lent his scarf to a senior, causing her to fall for him. When she called on him to personally say goodbye before graduating, he was oblivious until she told her not to send such a confusing signal. Later on, Babi is completely unaware of Eda's crush on him.
- Wolf in Sheep's Clothing: The Cell that was once thought to be Babi's Kind-Hearted Cell has wolf ears and is clad in fleece. It turns out to be an Overreacting Cell whose unnecessary kindness to girls he isn't dating tends to get him into relationship troubles.
Soonrok Shin
Soonrok Shin
- Clark Kent Outfit: Between his crisp suits and loose casual clothes, he doesn't show much muscle. It's revealed that he's very well-built when he catches Yumi in the middle of a Staircase Tumble.
- Covert Pervert: He comes off as either cold or innocently affectionate, but his Naughty Cell is larger than he is and as muscular as Daeyong's cells.
- Cute Bookworm: When he's at home and able to enjoy his books in comfort, his eyes become round and his hair returns to its natural curly shape. He and Yumi acknowledge how cute he is in this state.
- Hates Small Talk: As a textbook introvert, his energy drains in social interactions so he takes the route of least conversation whenever small talk is involved.
- Last Guy Wins: He's the last of Yumi's love interests to be introduced — appearing only in the last 70 episodes of the 511-episode series — and is the one she eventually marries.
- Mr. Imagination: He loves coming up with imaginary scenarios in his alone time and can fully immerse himself in the settings.
- Non-Standard Character Design: His Naughty Cell and Tongue Cell are large and muscular, compared to his other Cells which are just like everyone else's.
- Sharp-Dressed Man: He wears crisp suits in the workplace, which contributes to his cold, professional image.
- Strictly Professional Relationship: He has a strict rule of not dating coworkers and draws a line when he catches onto Yumi's hints. He also likes to break his own rules and confesses his feelings to Yumi as soon as he has his Love Epiphany.
- Sugar-and-Ice Personality: He operates on "low power mode" at work to save his energy. He only uses his Rational Cell to get through the day, which makes him come across as quiet and emotionless. In his comfort zone, he is a lot more empathetic and affectionate.
- Third-Option Love Interest: Woong proved to be too immature for Yumi, and Babi failed to admit his feelings for his part-timer until Yumi caught on and lost her love for him. Soonrok is a nice balance between the two. He's mature and professional but has a cute and fun side.
- Too Much Alike: His blind date with Soohyun doesn't work out because she's so much like him that he has nothing to ask her.
Other Characters
Ruby
Ruby
- Brilliant, but Lazy: Her mill is more advanced and potent than that of the other characters, but it doesn't get much use.
- Clingy Jealous Girl: She is pretty hostile to anyone who she thinks is eyeing Wook, and even attempts to get in their way. She stops doing this when she gets over him.
- Hopeless Suitor: No matter how much she drives other girls away from Wook, she doesn't stand a chance because he's not interested in girls and already has someone else in mind.
- Oblivious to Hints: Carelessly says things that offend other people. Sia's Cells try to get her to shut up by using a Hint Radar, but it turns all seven of Ruby's radars are coming up with strange analyses that lead her to think that Sia is after Wook and that her Stealth Insult is a compliment.
- Rejection Affection: Ruby continues to pursue Wook for three years even though he's clearly not interested in her.
- Second Love: She gives up on Wook after three years of unsuccessful pursuit of him, and ends up falling in love with Control-Z.
- Third-Person Person: Invoked. She sometimes refers to herself in third person when she wants to flaunt her cute persona. When she tells Control-Z to "Draw Ruby!" he takes her for a bewitcher who's using the dark magic of romance.
Sia Seo
Sia Seo
- Career vs. Man: The reason she suppresses her emotional side, and avoids pursuing Woong romantically despite being in love with him, is because having a boyfriend would hinder her ambition to be a famous art director.
- Clingy Jealous Girl: She and her cells have been hiding repressed emotions for Woong because of fear that it would get in the way of her job. Once Woong starts dating Yumi, she starts interfering with their relationship.
- Emotion Suppression: Literally has her Emotional Cell locked up and masks her romantic feelings for Woong.
- Married to the Job: As a means of trying to suppress her love for Woong. Her Love Cell, as a result, isn't focused on romantic love at all; it's actually a love of her career, while her Emotional Cell is the more romantic one.
Daeyong Ahn
Daeyong Ahn
Yumi's publisher who had a crush on her when they were in college.- Hopeless Suitor: He tries to win Yumi over after he becomes her publisher, unaware that she already has a boyfriend. He backs off when he finds out and instantly falls in love with Babi's own Hopeless Suitor, Yunhee.
- Non-Standard Character Design: His Cells are realistically proportioned and freakishly muscular.
- Punny Name: He uses his given name to give himself the go-ahead in certain situations. He adds his family name to stop himself from doing things.
- Sugar-and-Ice Personality: He's naturally a sweet person, but lashing out lost him a relationship. He adopted a cold personality so that he could surprise people with his sweetness.
Control-Z
Control-Z / Jiwon Song
- Only Known by Their Nickname: His real name is revealed in a flashback, but he is only ever referred to as "Control-Z" or "Z" for short.
- Second Love: He closes himself off to the dating scene after his girlfriend of 10 years dies, but eventually falls in love and gets together with Ruby.
- Undying Loyalty: Though he lacks a Love Cell, he makes up for it with his Loyalty Cell, which helps him keep his relationship afloat for 10 years.
- What Is This Thing You Call "Love"?: He doesn't have a Love Cell. When a girl first confesses her feelings to her, his Naughty Cell tries to kiss her, which weirds her out. After that, he decides that loyalty is similar enough to love and has his Loyalty Cell carry out those duties.
Soohyun Kim
Soohyun Kim
Soonrok's blind date and a rival author to Yumi.- Bitch in Sheep's Clothing: She looks like a Shrinking Violet at first and makes Soonrok so comfortable that he just isn't attracted to her. However, she didn't give him a chance because he immediately showed his sweet side, only to pine after him once she saw his cold side at work. When she catches him being romantic with Yumi, she tips off his boss that they're dating and steals an idea from Yumi's manuscript.
- Pen Name: Isabelle. It contributes to her anonymity when Yumi wants to confront her.
- Too Much Alike: She's not attracted to Soonrok because he's too much like her, not the cold Sharp-Dressed Man she was expecting.
