Luna is a girl who is in High School. She always pays attention to her studies and her friends. She never loved anyone after her first love, Hyungsik. They soon broke up after he moved to Europe even though they both had feelings for one another. She starts dating a boy named Baekhyun, who reminds her of Hyungsik. She falls in love with him. She later finds out that he dated her only to date her best friend, Jooyeon.