After Midnight (1921)

Two brothers take opposite paths in their lives. Gordon Phillips (Conway Tearle) is wealthy but becomes a drug addict. Wallace Phillips (also played by Conway Tearle) is poor and wants revenge on his brother, who cheated him out of their father's fortune. One day, in a Chinese restaurant, Mock Sing (Warren Black) notices the resemblance between Wallace and a man in the back room taking opium, who happens to be Gordon. Mock Sing suggests to Warren that he impersonate Gordon to reclaim his riches. Wallace agrees to impersonate Gordon.