Incest between siblings: After being divorced for half a year, the younger sister lives in her mother's house and actively seduces her brother to cuckold his wife.

Half a year after her divorce, the younger sister temporarily stays at her parents' home, where she develops forbidden desires for her older brother. She actively seduces him into an intimate relationship, cuckolding her brother's wife. This is an adult drama film focusing on the breakdown of family ethics and incest themes, depicting how the sister exploits the opportunity of living together at their parents' house to gradually lure her brother into betraying his marriage, exploring humanity's primal impulses and moral conflicts.