He's Dedicated to Roses

He's Dedicated To Roses is an eleven-volume Manhwa by Mi-Ri Hwang, also the author of Cutie Boy and Hot Blooded Woman.

I-Da Choi has life pretty rough, being forced since a young age to be a slave to the daughter of her parent's boss, Mi-Mi. So in order to relieve stress, she dresses up as a boy, Yo-Dah, and goes around calling up gangs so she can beat the shit out of them. Along the way, she makes two friends, Ju-Nah and Shi-Nah, neither of whom mind him keeping his background secret, especially since they've got a few secrets of their own. Then one day, she gets kissed by a complete stranger as I-Da in order to fool said stranger's clingy girlfriend. When she later pays the stranger back, as Yo-Dah, he mistakes her for his dead little brother, Mi-Ru. The next day he starts showing up at her school looking for Choi Yo-Dah, and so a complicated drama commences.

This series provides examples of:

 * Aborted Arc: It seemed like Nu-Na was going to play a bigger role, but Ju-Nah very quickly takes care of her and she's hardly heard of again.
 * Alpha Bitch: Mi-Mi, while the trio reoccur as minor villians.
 * Asshole Victim: Anybody Yo-Dah goes after. Also,.
 * Attempted Rape: Early on, several thugs try this on Mi-Mi, but quit after their boss falls in love with her.
 * Batman Gambit: Na-Ru's grandfather pulls one to
 * Bifauxnen: I-Da makes an effeminate but effective boy.
 * Bitch in Sheep's Clothing: Mi-Mi, who veers into Moral Event Horizon territory near the end.
 * Bully Hunter: Yo-Dah. Shi-Nah even lampshades it after Yo-Dah threatens to beat him up after catching Shi-Nah stalking him.
 * The Casanova: Ju-Nah.
 * Clingy Jealous Girl: Mi-Mi, who crosses the Moral Event Horizon in order to get revenge on Na-Ru for dumping her. Also Nu-Na and an unnamed girlfriend of Na-Ru, but they aren't as bad just because they have much, much less screentime.
 * Defeat Means Friendship: The finale shows that I-Da and the trio have become good friends.
 * Despair Event Horizon:
 * Dissonant Serenity: Hok-Yoon hardly even stops smiling, not even when he
 * Eerie Pale Skinned Brunette: Mi-Mi and I-Da/Yo-Dah
 * Four Eyes Zero Soul: Shi-Nah, at first.
 * Humiliation Conga:
 * Important Haircut: I-Da
 * Jerkass Has a Point: An unintentional example.
 * Jerk With a Heart of Gold: Shi-Nah.
 * Kick the Dog; While Na-Ru is a nice guy, he does some pretty ass-holish things, like abandoning Mi-Mi to be raped by a gang and
 * Kick the Son of A Bitch: Let's just say Mi-Mi deserved her fate in the finale and leave it at that.
 * Laser Guided Karma: Works for both sides. Mi-Mi
 * Loves My Alter Ego: Pretty much the premise of the entire series is I-Da worrying that Na-Ru will hate her if he finds out she's a girl. Also, the leader of the trio falls for Yo-Dah, and is understandably miffed when he: 1. dumps her for Na-Ru, and 2..
 * Manipulative Bitch: Mi-Mi, due to her use of the Wounded Gazelle Gambit, is an even worse bully than Sae.
 * The Matchmaker: Gang's secretary ships
 * Meganekko: I-Da.
 * Nice Job Fixing It Villain: The leader of the Girl Posse
 * Official Couple:
 * Rich Bitch: Every rich woman in the series, but Mi-Mi takes the cake.
 * Spanner in The Works: Na-Ru's grandfather's secretary.
 * Stalker With a Crush: Ho-Sup Jung.
 * Sweet On Polly Oliver: Pretty much the entire series' premise.
 * Sweet Polly Oliver: Yo-Dah, minus the "sweet" part.
 * The Glasses Come Off: When I-Da is Yo-Dah.
 * Trauma Conga Line: I-Da through most of the series.
 * Unwitting Pawn: Hak-Yoon.
 * Victorious Childhood Friend: Ju-Nah to Nu-Na.
 * Wholesome Crossdresser: Yo-Dah/I-Da.
 * Wounded Gazelle Gambit: Mi-Mi to poor, poor I-Da.
 * You Gotta Have Blue Hair: Almost everybody except I-Da has technicolor hair.
 * Wounded Gazelle Gambit: Mi-Mi to poor, poor I-Da.
 * You Gotta Have Blue Hair: Almost everybody except I-Da has technicolor hair.