Hyo-gil, an aspiring graphics novelist who is spending the last year of his twenties listlessly, kills time in his mother’s stationery store. One day, he gets a letter from Ji-hwan, a member of his band back in high school, along with some sheets of music score. He sets off to find Myeong-jae, another band member who is now a teacher at their alma mater, to try and play the music. They visit the school band’s practice room and come face to face with memories of the past that they had forgotten all about.