Help me. Whats this manhwa

I dont remember much about the story but its isekai and fl basically got adopted by the og fls family. Ml is og fla brother, gets possessed by a demon and stuff. Og mls were extremely toxic, tried to kill ml and fl for being close to og fl. The ml has glasses btw. I think he has white hair too. Later on in the story og fl gains powers of magic from strong spirit cause like another spirit of darkness gatekept her magical abilities. Please help me with the name. Art was stunning btw