Death; the third when there’s only two, the one who slips between your fingers. Even death, can be the inhibitor for them. Lovers; who claims that their love will stands forever.  

A girl named Minji fell in love with her sunbae, Oh Sehun. She always crazy about him, and not realized that her senior named Luhan loved her. And there comes an accident, that make Minji knew about Sehun's feeling.