Kim Minji's mom, kim hyonjung, was a victim of a murder crime. in order to get a revenge for her, minji went in hankuk university as a professor. Pham Hanni is the primary suspect for the said crime. she will do anything to prove her innocence and the only way for that is to win minji's trust. however, minji got a mission from her dad. "make her fall in love with you, make her suffer and .... kill her". but kim minji developed her feelings for hanni. how is she going to do her revenge?