XD! This parts a little confusing for folks who haven't read the novel.
Meng Yao was found and promoted by Nie Minjue, but always wanted to return to his clan (Jin). Nie lets him go when Zewu-jun kindly supports that dream. Turns out, the clan leader Jin Guangshan (and Meng Yao's real father) never recognized him even with letter in hand because he has dozens of bastards from dozens of women and he's just an asshole in general. Nie comes looking for Meng Yao and juuuust happens to see his former disciple setting up a murder. (Stab stab)
If you want updates more quickly, I suggest everyone read the novel! It's well translated and available here:
https://exiledrebelsscanlations.com/novels/grandmaster-of-demonic-cultivation/