Ryeowook was always treated badly by his step-mother Jessica and his two step-brothers Kangin and Siwon ever since his father Donghae died when he was 5. He was abused and treated like a slavemanly because of their horrible cat Heebum. Ryeowook was not popular and only had 2 friends Sungmin and Kyuhyun who were like his brothers and always understood how he felt. He also never had any feelings for the girls in his grade. However, it all changed when he met Yoona. who was the daughter of  the richest family in Seoul known by the name of Im. At first sight, his heart beats rapidly as he relises he is in love. The next thing he knows is that she is bethrothed to someone in the school who turns out to be Siwon. The truth hurts him badly after she goes to their home with her parents for dinner. There, Siwon humiliates him causing him to runaway. He then gets in big trouble when Jessica finds out and treated even worse than before. Then there's the school ball for Yoona's birthday. Yoona secretly invites Ryeowook and confesses her feelings. Kangin, who evedropps decides to tell Jessica the whole story which then causes...