Kang Bok-gu is a skilled K-1 fighter. He lives in the same house with Han Da-jung, who saved him from a fire when they were teenagers. Min-gu, Bok-gu's older brother, attempts suicide upon learning of the engagement of his ex-girlfriend, Cha Eun-suk. Eun-suk is an upcoming actress. Caught in a compromising position with Kim Joon-sung, heir to a large conglomerate, she is forced into an engagement with him. As Min-gu lies in a vegetative state, Bok-gu learns of his relationship with Eun-suk. Min-gu had taken care of Eun-suk and her family, often helping them out financially, before Eun-suk became a famous actress. Bok-gu incorrectly assumes that Eun-suk is a social climber who broke up with Min-gu upon achieving success because she thought he would be a burden. Bok-gu blames her for Min-gu's current state and vows revenge.