Yoon Bomi, once she entered the Seoul Institute Performing Arts Universty, faces a whole new world. And once he met this boy her point of view in love became different and somehow changed her. But this love or should I say so-called first love is just pain for her? and there were his met this another boy, who helped her moved on from her first love. Who will takeover her heart? Her first love? on which they say that "first love never dies" or the man who helped her move on

A heir to his parents company, Kim Taehyung, finally takes action to be close to the person he admires. When the chance came, he finally met Yoon Bomi, the youngest in their family, she had always wanted to have a big brother of her own. What would happen to them if Bomi gets to know all of Taehyung's hidden secret? Would she still accept his heart?