I'm Really Not a Demon Cultivator.

Wu Ren was originally a great monk in the period of transcending the tribulation. During the period of transcending the tribulation, he was attacked by a demon cultivator and unfortunately died. After his rebirth, he became the son of the master of the demon sect. Master, please don't kill me. Everything I say is true. I was really your disciple in my previous life. I'm really not a demon cultivator, I just went to the demon sect to work as an undercover agent. I'm not my father's biological son, really.