The Demon King, Lord Muzan Kitbutsuji Was Known For his Cold And Rude Personality Towards but...It all changed when You were there, "The New Uppermoon 4"... He Can't Help But Slowly Falling In love With You While He Tried Not to,He just failed to.. it's Because of Your Personality, kind and helpful towards others, Your Beauty, Your Appearance.. His still kept his Cold and Rude Personality towards others But With You.. Was Different..