Na-mi and Sun-woo, the outcasts in school, plan to commit suicide instead of going to the school trip. On the moment of success, they find out that the girl, Chae-lin, who made their lives miserable is living a new happy life in Seoul. So, they decide to make revenge before ending their lives. However, when they finally spot Chae-lin, they see a good-hearted girl in front of them which makes their plans go awry.

After her father passed away, Summer stopped taking photos. One day, she falls for Yeonwoo, the school's soccer star, and takes her picture with her late father's camera. When she develops the film, she finds mysterious photos of her father's high school lover. In these photos, Summer uncovers a secret about her father. Will she be able to pursue her first love and uncover her father's hidden truth?