Park So Jin, an average twenty-four year old woman, is in for a surprise when a tortured young man breaks into her house. The man is Lee Hongbin, a once normal man turned psychotic by a crazed ex-girlfriend. Will So Jin be able to help Hongbin regain his sanity, and take revenge on the woman who broke him in the first place? And can she manage to keep a hold of her own sanity in the process?