

Lee-won, a university student majoring in acting, has a rivalry with Ji-oh, a directing major. Despite their constant bickering, they often have to work together. Unbeknownst to Lee-won, his younger sister is writing a web novel where he and Ji-oh are lovers. When he discovers her secret, he vows that if he secretly likes Ji-oh, the novel’s storyline should come true. As they spend more time together, Lee-won begins to question if his feelings for his enemy are becoming something more....

Young-ho doesn't have any dreams for his life. He has been studying for three years to enter a university. He decides to send a letter to his childhood friend So-yeon. But her younger sister So-hee receives the letter instead of her sick sister. So-hee writes back to Young-ho, pretending to be So-yeon. Meanwhile, So-hee takes care of her sick sister and also runs a secondhand bookstore with her mother....