Middle school teacher Hyung Koo leads an ordinary life. A transfer student named Joseph arrives from America. As it happens, his mom is the teacher’s first love, Shin Na, who hasn’t seen in 15 years. Hyung Koo rekindles his dream of reuniting with her. Shin Na, after achieving considerable success as a novelist in America, has returned as a divorced single mother. Sure enough, though, at her side is a worthy rival. Hyung Koo, acting as a shield for Joseph, who looks up to him, decides to try again with Shin Na one last time.