- meet sungyeol a normal guy during the day but turns out to be a bad during the night. when he was young he used to live with his parents, but because of an accident his whole life turned upside down. when his parents died he was left alone with his younger brother in their mansion. they may be rich when it comes to money but poor when it comes to respect, care. and love. sungyeol made a promise with hyeri when they were young. when he moved out he joined a gang called "RIVAL" he became the leader after many years. his life changed when he met minyoung again-