After Three Years of Working Undercover in the Sect, I Became the Son-In-Law of the Leader!

Lin Yan traveled through time and became the holy son of the sect, but was sent to work as an undercover agent in a nearby demon sect. Who knew that the head teacher of the undercover sect had three daughters! The senior sister is gentle and considerate! The second senior sister is cold and arrogant! Third senior sister is so charming! ………… Facing these three powerful senior sisters, Lin Yan was shaken. Who said this undercover job is a high-risk profession? Wouldn't it be nice to just go with the flow and become a son-in-law and inherit this heavenly demon sect? ………… I'm not very good at writing introductions, so please read the text! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.