Stephanie is going to get married in a few day but unfortunately, she and her groom get into an accident when they are hit by Kid's car. Her groom dies but she survives. Kid, their litigant, also loses his wife in the accident.  He pays for Stephanie's medical treatment and visits her every day. Their relationship quickly deepens, and she soon finds out his son is Nickhun, a man she was in love with in her youth.  Stephanie had stalked and pursued the arrogant Nickhun, but was mercilessly rejected and humiliated by him.  She does not love Kid but accept his marriage proposal and decide to seek revenge on Nickhun. Stephanie decided to move to Kid's house and pressured her sister Tiffany move in with her after flying in hearing the news of her sister getting married. Nickhun becomes enraged by the marriage and the new family members moving in. He specifically targets Tiffany because she stands up to him and defends her sister.  He quickly finds himself intrigued by her, but also enjoys making Stephanie mad with envy, whenever he pays attention to Tiffany. The relationships turn volatile, with conflicting emotions of revenge, loyalty, duty, hate and love, all thrown into the mix.