A drama about incest between siblings. Mao lives with her parents and younger brother. One day, her younger brother becomes a recluse due to bullying at his part-time job. The younger brother, who tends to stay depressed at home, eventually begins to look at his older sister Mao with lustful eyes and tries to pressure her into a sexual relationship. With complicated feelings, the older sister is unable to refuse. Her parents turn a blind eye to the dark side of the family. Mao is isolated within the family and continues to be creampied by her younger brother.