*Muzan is a demon king who were being evil, cruel, and etc. Muzan has a secret that he never ever told to the uppermoon.. The secret was he secretly like/love an hashira(you) but one day he die at the epic fight at the infinity castle but... He got reincarnated and right now he probably at the child age, one day Muzan was bring his book to read but he accidentally bump into you, you didn't know that the kid was Muzan cause he was apology to you*