Once a Thief (1991)

Potty Cake (Chow Yun-fat), Azhan (Leslie Cheung) and Hong Dou (Chung Chung) are all orphans who became international thieves under the cultivation of their adoptive father (Tsang Kong). When he grew up, he became an art thief who helped him make money, and the three of them also recognized a policeman (played by Zhu Jiang) as their godfather.