Sinb is a daughter of a mafia boss. but, she didn't know her father's activities. not until her father died. When her father died, the organization of her father passed to her. And as she grows, she is still finding justice for her father's death. In her high school days, she always get bullied for being fat and has messy appearance, then there's this girl who saves her from drowning her own thoughts. what will gonna happen if the shy girl will be the mafia boss and take revenge to the people who bullied her and especially, to the people who killed her father?

An unexpected romance between mischievous womanizer and a competitive tsundere. Yerin is a mischievous womanizer during her middle school and high school years, she always do silly pranks to some students not until she met a competitive tsundere who named sinb.

[SEQUEL OF MAFIA'S REVENGE] Sinb is a mafia boss of an illegal organization after she graduated high school, but she changed her lifestyle after her former friend, named yerin became her girlfriend. But also, what if someone came back into their lives? how will they handle it? What if an Ex mafia boss become an ordinary woman again? Is there any difference being a mafia boss and ordinary woman?