Seventeen years ago, an assassin ambushes triad boss Yau. Yau’s wife, Nam, sends Chai, Kam and others to find the assassin. Chai catches the assassin and discovers that he is Meow, Chai and Kam’s childhood best friend. To save his friend, Chai helps Meow flee Hong Kong. Though Yau survives the attack, the injuries leave him crippled for the rest of his life.
Louis Cheung Kai-Chung (Chinese: 張繼聰, born 11 January 1980) is a Hong Kong Cantopop recording-artist, songwriter, and actor. He is an alumnus of The Hong Kong Academy for Performing Arts, majoring in acting. His first play was in 1997, and he has performed in a total of more than 20 stage plays, including the classic "A Streetcar Named Desire", as the main character, Stanley Kowalnski.