Story follows the pain and growth of 17-year-old Min-Jae (Yoon Chan-Young) and Seo-Yeon (Park Si-Eun). Min-Jae is an ordinary, male high school student. He doesn't talk much and he has a bit of a sensitive personality. Min-Jae gets good grades and doesn't cause trouble. Seo-Yeon attends the same high school as Min-Jae. They also graduated from the same middle school. She is an ordinary, female high school student. Two years ago, her parents divorced. Since then, she has lived with her mother.