Kim Myeong-Je (Lee Chun-Hee) is a college student, nicknamed Toad because of his pimples. He meets Han Seo-Yeong (Kang Ye-Sol) at the library and falls in love with her at first sight. He soon joins the singing club to get closer to her, but Han Seo-Yeong has feelings for Seo Jeong-Wu (Kim Jung-San). After being rebuffed by Han Seo-Yeong twice, he is soon drafted into the army.

Baek Jang-Mi (Choi Yoon-Young) is a college student at the same university and a member of the singing club. She also has a crush on Seo Jeong-Wu, but she sees Han Seo-Yeong getting closer to him. Because of her ultra-strict mother, Baek Jang-Mi's hopes of romance with Seo Jeong-Wu soon ends.

6 years later, Kim Myeong-Je and Baek Jang-Mi meet again at a bank.