This is the story of Taemin, a sweet-pleasant guy, but with “appearance problems” since, at first glance, people always mistake him with a girl. It all starts when Taemin is about to go home with his mother after being in a boarding school. But when he was about to leave, his mother dies in a helicopter explosion. Disconsolate, returns with his uncle HeeChul, to live with him in a pension, but his (other) uncle Siwon takes him to live in his mansion. Taemin's life changes when he meets again with his cousin MinHo, who Taemin has been in love since childhood. MinHo, who will become his guardian angel, will prove to Taemin many good things about life, but the enemies will show up under the same roof, who are responsible for making Taemin’s life impossible: Hyunah, the whimsical MinHo’s fiancée; Jessica, his own cousin, but mainly Lee Hyori, the mother of MinHo, who was declared as Taemin’s enemy to death. Taemin will have to beat people who will hurt him, at the same time he will turn out as friend and confidante of those who really feel appreciation for him, especially MinHo. But as the days pass by, he not only discover who is the heir to the fortune of his family, but the evil Hyori’s dark secrets that are slowly coming to light, a secret that she will do ANYTHING to keep in the shade ...