Seventeen-year-old adolescence Woo Min is on his own and lives with Soo Jeong who used to be his parents' caregiver. Woo Min secretly grows fond of Soo Jeong who can't speak but finds out she's sick and feels the urge to protect her... However, as a poor minor, there's nothing he can do let alone pay her medical bills. One hot season, Woo Min sets off for a cruel world to save her.

First Love

Sang-won, Seung-jun and Min-wook are high school best chums. However, after graduation, they are in three different places in life; Sang-won is a college student, Seung-jun studies one more year to enter the college, Min-wook performs his military service.  One day, two friends visit Min-wook in the army. Seung-jun has another reason for a visit to bring the break-up letter from Min-wook’s girl friend, Esther. Once three boys reunite, they spend one night of carousing devoted to the poor military boy and try to find when to give the letter. Before they separate, will the Dear John letter be delivered successfully? The trio allows their adventure to continue.

Sunshine Boys

When Man-seob comes back to school after completing military service, he organizes the school's Jokgu team to win Anna's heart.