i am confusion.. who’s the real son

Rong is Mr. Lui’s biological son whom he conceived with a lady at a brothel. Mr. Lui’s former wife (who I think adopted Chung, and that’s where the three of them met) adopted both Rong and Wang and brought them into their home. Wang is not biologically related to Mr. Lui.

The one with the long silver hair is the adopted one and the one with the melanin is the biological one