Yoo Tan is the leader and vocalist of an indie band called One More Time, a band he started with his childhood friends ten years ago. The indie band flourished for a while even boldly refusing to succumb to the establishment at one point. But Tan is getting older, the popularity of his band is dwindling, and life isn’t getting any easier financially, so he eventually signs with a music label. While enduring the difficult conditions inherent at a major music label, an unforeseeable event takes place sweeping Tan up in it: An unwanted time leap which allows him to journey back in time to regain his girlfriend.