Im Yoona is a very bright and cheerful girl but changed because of an incident. 2 years ago, Yoona fall in love with a boy named Minho and give it all her best and confessed to him. Minho accept her and they become a couple that was envied by everyone. As Yoona fall for him more, she was humiliated in front of everyone one day. Knowing she was just a toy to Minho, she transfered to another school and luckily no one even bother her attendance. Yoona try to keep her distance from people from that day. And one day when she is working at her cafe, an old man whom is the cafe's regular customer since last month asked her to become EXO's manager. She was desperately need money since her mom left her with debts and agreed. All of EXO member seem show their interest toward Yoona since the first day she become their manager. She keep warning to herself to keep her distance from people but what will happened when she met EXO and spend her time with them? Will she break her own promise for not falling in love as one of EXO's member catch her eyes? Unexpectedly, Minho whom is her nightmare appeared and debut as a member of SHINee whom is the same company as EXO. Minho kept on appearing and told her that he want her back. What will happened when she met Minho? Whom will she choose? Minho her first love or the EXO's member that always by her side and she pay attention to?