"I actually knew. I know what kind of person you are, sis." "What...?" "Don't move, just stay still." One day, the only blood relative brother brought home a woman and her daughter. Four people bound together by the frame of family. The little girl, So-yu, who particularly followed Ji-soo. And the family that shattered after a brief moment of happiness. After losing her brother and his lover, Ji-soo firmly held the hand of young So-yu and made a resolution. To live happily together with this child for a long time. By chance, Ji-soo accidentally got excited after watching a video on the computer. She was caught in the act. By the little girl, So-yu, whom she thought was just a child... And it began. The violent and terrible possessiveness of that little girl, So-yu! Now... there's no escaping!