Twinkling Watermelon

Eun-gyeol lives with his father, mother, and brother who are all deaf. For his family, he's a good student with a bright future in academics, but he's secretly a gifted guitarist who performs at night.

Eun-gyeol joins SPINE9, a band in Hongdae. However, when his father finds out and gets mad at him, he decides to give up music and sell his guitar.

Eun-gyeol meets his young father, who wants to start a band for a girl, and pretends to be Yoon Dong-jin, a musical genius.

Eun-gyeol meets teenage Se-kyung and feels confused as he learns about her life. He tries to follow Yi-chan and becomes his math tutor.

Eun-gyeol decides to stay by Yi-chan's side to protect him from an accident. They form a band to play at the school festival.

Everyone is confused when Se-kyung returns. When she tries to get close to Yi-chan, Eun-gyeol sternly warns her to stay away.