@Ais Jun She was an adopted daughter and she and his siblings didn't know it. They thought that she is an illegitimate daughter of his father. It is not a spoiler but it is based on the spoiler I gathered somewhere else because it didn't specify how they didn't know about i
Genres that I like to read: Cultivation, Isekai, Idol/Entertainment-Related, BL, Baby MC, and many more. Lols.