Kum-Ji's only reason to live was her sister until her sister was forced into marriage by her stepmother. Her world was consumed by loneliness until she was abducted. Kum-Ji finds out that she was mistaken for a wealthy rich daughter because they both had the same face. In order for her to survive and find her sister she agrees to do the job that they had assigned her to. Kum-ji is turned into an assasin and is to infiltrate the house as the daughter and kill the family one by one. As Kum-Jii enters the household many things are revealed that Kum-ji wishes she had never found out.