Au Revoir Shanghai (2006)

The story takes place in the 1930s. Nip Chun (Michael Miu), one of the most influential gang leaders in Shanghai for the past twenty years, decides to retreat after the sudden death of his wife. He earns his living by selling Shanghai steamed buns, and to make it up to Ho Shui Sau (Anne Heung), he hires the lady as his helper. His withdrawal from gang activities has deeply disappointed Shek sai kau (Bosco Wong), who is an ardent follower of him. Chun was determined not to get involved with any criminal activities. But when he finds out that Wu Tai Tsuen, a buddy from his gang, may have something to do with his wife's death, and when he sees how his former gang mates are mysteriously killed one by one, he knows it is time to make a comeback. Chun and Tsuen have a series of fights. And what happens next makes Chun believe that there is actually a conspiracy against him. But that is not the end of the trouble, and the biggest shock comes when he learns that his beloved daughter Man Wah (Shirley Yeung), is not the true offspring of his but Koo Cheung Shins's, who is his benefactor and a wealthy tycoon.