Hyun-soo, a 39-year-old former opera singer surviving on a convenience store part-time job, meets Sol-ji, an 11-year-old girl who dreams of becoming an idol despite her lack of singing skills. Through the rhythms of hip-hop, opera, and idol pop, the two heal each other’s wounds and move toward their dreams in this cross-generational musical coming-of-age drama.
| Actor | Role |
|---|---|
 Ji Il-juHyun-soo | Hyun-soo |
 Kim Yun-seulSol-ji | Sol-ji |
 Jo Young-jiEun-jung | Eun-jung |
| CChoi Yun-bongPD Kim | PD Kim |
 Nam Ji-wooYoung-hwan | Young-hwan |
| JJeon Ha-rinYe-na | Ye-na |
 LoopyXylo | Xylo |
 Han Geum HeeNot listed | Not listed |
 Hwang Si HyeonNot listed | Not listed |
 An Seo YeonNot listed | Not listed |
 Iimura YunaNot listed | Not listed |
 Kang Du NaNot listed | Not listed |
 Yoo Su ANot listed | Not listed |
 Koo Ye HamNot listed | Not listed |
| SSeok In-moNot listed | Not listed |