Responses
From the spoilers I read
There is ABSOLUTELY no Harem.
He only has eyes for his wife
(Link: https://www.novelupdatesforum.com/threads/keep-a-low-profile-sect-leader-%E6%8E%8C%E9%97%A8%E4%BD%8E%E8%B0%83%E7%82%B9.179998/)
Dropped this when that cool girl started blushing around MC. Their romance was too fast face and also cause the sister is showing signs of yknow, liking her own brother-_-. Kinda scared me tbh, can someone tell me if the sister and the MC got together or nah?