Doo-Sik (Jo Jung-suk) gets paroled from prison thanks to his younger brother (Do Kyung-Soo) Doo-Young. Doo-Young is a promising judo athlete. After 15 years, Doo-Sik (Jo Jung-suk) suddenly appears in…

On a live music radio show, a letter arrives from the 23 years in the past. Through the letter, the first love and friendships of five friends are revealed.