Jeong Im's husband comes out of the closet and the two divorce. One day, she sleeps with a young man, Byeong Seok. To her surprise, he is her daughter's boyfriend. Meanwhile, Seung Rok moves into the same apartment where his fist love, Jeong Im, lives. Seung Rok enjoys a date with her, but soon Jeong Im learns that he is Byeong Seok's father. Four people experience conflict in entangled relationships. However, they ask themselves what it means to be a `true family.'