Doppelganger - Season 1 Episode 14 14

As Ai Ling reaches the terminal stage of her cancer, she wishes for Shun Tian to let the cat out of the bag. Shun Tian exposes the fact that Rui Ming is his stepbrother, and was chased out of the house along with his mother because of his status as a illegitimate child. Rui Ming empathises with their plight and decides to take up his responsibility as a big brother after the passing of Shun Tian's mother.