Please help

Can someone help me? So I was reading a story on another website but it didn’t save it so now it’s gone and I don’t remember the name. The story was about a guy who got reincarnated into a game his girlfriend used to play, he took the body of a king who has a daughter who he didn’t treat very well and was getting married to benefit the country or something. He goes into a magic tower and then somehow unlocked someone who was put into there for having a lot of magic by the emperor. He and the king have sex cus it help the king or something I can’t remember what’s wrong with him, the dad of the boy his daughter is gonna marry likes him and wants to sleep with him so yea that’s that there is more but I can’t remember, also he feels bad for the daughter Bc she isn’t used to her dads love and was told to do things to benefit them, and now he treats her kindly and gets her opinion on stuff. Does anyone know the name??