 Yin is a lonely woman whose husband Keung treats her as his sex slave; she wants to kill him but never has the courage. He is always traveling to Shenzhen for whoring and once raped her friend Hong. Hong s partner Long has thrown her out of their apartment. One night after karaoke, Long and Yin begin a sexual affair. Long decides to kill Keung. Hong and Yin share their tragic past with Yin confessing about her fling with Long. Then Long turns up at Keung s apartment, having hatched a murderous plot with Yin...