Three years into her marriage, wife Serina enjoys a happy daily life. One day, while folding laundry as usual, a masked man suddenly breaks into her home and assaults her. The man is revealed to be her husband's younger brother, Koji. Koji has long harbored intense feelings of inferiority toward his older brother, who has achieved success in his career, lives in a nice house, and enjoys a blissful marriage with a beautiful wife. These emotions have twisted into uncontrollable desire for Serina, driving him to madness. An explosive storyline unfolds, threatening to destroy the bonds of family.