Choi Young Do is 18 year old inheritor of luxurious chain of hotels and resorts. He's genius with IQ150, and mensa member, but his intelligence is mainly used to make lives of those around him living hell, rather than studying. His father Choi Dong Wook is about to get married to Lee Esther which will make Yoo Rachel his step-sister. He has mixed feelings about this marriage. He's looking forward to merger of assets but he's still scorned by what his family did to his mother. In fact his behavior seems to be completely controlled by his inability to move on from that childhood event.