Mr. Six (2015)

Mr. Six, a retired mobster in Beijing, finds himself in a desperate situation when his son is kidnapped by a rival gang. Determined to seek justice and protect his family, he embarks on a dangerous journey into the criminal underworld, facing powerful triads and the corrupt forces that control them. As he delves deeper into the world of organized crime, Mr. Six must confront his own dark past and make difficult choices that could cost him everything.