- Casting Gag: Ju Ji-hoon shot to stardom playing Crown Prince Lee Shin in the 2006 rom-com Goong. Here he plays a crown prince again, but one with much bigger problems.
- Darkhorse Casting: In the English dub, besides Greg Chun and a cameo from Johnny Yong Bosch, most of the cast was voiced by new actors, mostly of Korean descent.
- Similarly Named Works: There are at least two other series called Kingdom.
http://tvtropes.org/pmwiki/pmwiki.php/Trivia/Kingdom2019
FollowingTrivia / Kingdom (2019)
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