Twinkling Watermelon

In 2023, high school student Eun Gyeol, a CODA with a passion for music, leads a double life as a model pupil by day and a guitarist by night. When he discovers a mysterious music store, he's unexpectedly transported back to 1995, where he meets his father, Ha I Chan, as a high schooler. I Chan doesn't recognize him and is infatuated with a cellist, Se Gyeong, not Eun Gyeol's mother, Cheong A. To set things right, Eun Gyeol joins a band led by I Chan, hoping to reunite his future parents and return to the present. (Source: MyDramaList)