Kitsune

So basically white haired fl, she has a child and black haired step child. She is married to some trash emperor. In her previous life she schemed and killed her step child so her son could be on the throne but her son was horrified and ended up killing himself. She went back in time and decided to value them both or something. She has water powers that weakened later on. She used to be an excellent mage and thats why the emperor married her

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