Red Lion

Red Lion is a seven volume romance manhwa by Yong-sun Kim

Eisul is The Red Lion, a a red haired girl gang leader that single-handedly reformed the gang underworld before disappearing without a word. Now she has moved to a new school and promised her parents she won't get in any more trouble, but first she must learn to choose between her past life of fighting as Red Lion and her calmer life at the new school.

Red Lion has examples of:

 * Action Girl: Eisul Kim
 * Alpha Bitch: Hyojung
 * Badass
 * The Beautiful Elite
 * Bishonen
 * Butt Monkey: Sejong
 * Can't Hold Her Liquor: Eisul just passes out after drinking some alcohol.
 * Cute Bruiser: Eisul
 * Cute but Cacophonic: Eisul
 * Dude Looks Like a Lady: Junhee Park, so much so that everyone's first impression was that he was a girl. It wasn't reveled after a break from school that he was a guy.
 * Everythings Better With Bunnies: Yumin's pet rabbit, Chorong.
 * Fiery Redhead: Eisul
 * First Kiss: Seungin stole this from Eisul.
 * Gamer Chick: Eisul.
 * Girlish Pigtails: Mijin Han
 * Handsome Lech: Seungin
 * Hard Head: Eisul
 * Kendo Team Captain: Seungin
 * Lethal Chef: Eisul
 * Lonely Rich Kid
 * Mad Love: Junhee
 * Martial Pacifist
 * New Transfer Student: Eisul and Junhee
 * Overly Long Name: Eisul's full name is this: Kim Bada Hanul Byulchurum Malgun Eisul
 * Paparazzi
 * Parental Abandonment: Yumin
 * Plucky Girl: Eisul
 * Redheaded Hero: Eisul
 * Rescue Romance: Inverted, when Eisul rescues Seungin from some angry jilted girls.
 * Rich Bitch: Hyojung, at one point she tries to kill Eisul.
 * She Cleans Up Nicely: Eisul
 * She Is Not My Girlfriend: Eisul tries to tell this to her parents.
 * Shrinking Violet: Mijin was this at first but has since grown out of it thanks to her friendship with Eisul.
 * Stalker with a Crush
 * Tomboy: Eisul
 * Tomboy and Girly Girl: Eisul and Mijin
 * Tsundere: Eisul shifts between Hot-Blooded and friendly.
 * Use Your Head
 * Viewer Gender Confusion: Junhee, so much so that when he was introduced, the idea that Junhee could be a guy didn't enter anyone's mind.
 * Yandere: Junhee