Su Jin had secretly loved Jiang Li for four years. With graduation approaching, he finally worked up the courage to confess, only to be gently turned down, just as he had expected. Heartbroken, he went to a bar to drown his sorrows, unaware that someone had drugged his drink. In the ensuing confusion, Jiang Che, his mysterious roommate who had rarely shown his face during college, took him home. The next morning, Su Jin woke in horror to discover that he had turned into a girl. As they spent more and more time together, he was gradually won over by Jiang Che's warmth and dependability.