Chi Mo Sai (Yuen Wah) meets Wong (Roger Kwok) in Auntie Fei's (Yuen Qiu) cafe and learns that Wong has photographic memory. He decides to exploit this skill by teaching Wong how to play Mahjong, but Fei, Wong's boss, strongly objects to it. Despite Fei's objections, Wong learns Mahjong from compulsive gambler Chi Mo Sai. He impresses triad boss Tin Kau Ko (Wong Jing). Wong falls in love with Tin's mistress (Theresa Fu) and is beaten by Tin's men. Wong then becomes crazy. Luckily, Fei cured him using Mahjong. Fei wanted Wong to beat Tin in the "King of Mahjong" competition and be the King of Mahjong. The film ends with a climactic "King of Mahjong" Competition. It is the only film made in 2005 to boast of having a sequel made in 2005.
郭晉安
as Ah Wong
元華
as Robert Chi Mo Sai
元秋
as Auntie Fei
梁崢
as Phoenix Girl
王晶
as Tin Kau Ko
傅穎
as Cheryl
黃泆潼
as Overbite Jan
田啟文
as Big-Mouth Kau
林子聰
as Balloon Lin
李健仁
as Masked Leon
李楓
as Auntie May
丁羽
as Uncle Ray
