Cast & crew
Secret: Untold Melody (2025)
Directed by Seo You-min Written by Shin Eun-kyung, Seo You-min, Yoo Seung-hee
Cast
| Kim Kyu-seon | Music |
| Kang Mal-geum | Min-gyu |
| Shin Ye-eun | Lim Hee-kyung |
| Kang Kyung-hun | Yeon-Wha |
| Ahn Seung-gyun | Geum-bong |
| Bae Sung-woo | Ho-Kwan |
| Won Jin-ah | Wan Jung |
| Im Sung-jae | Tae-suk |
| Doh Kyung-soo | Yu Shu Lien |
| Kong Hyun-ji | Train Conductor |
| Doh Kyung-soo | Yu-jun |
| Won Jin-ah | Jung-a |
| Shin Ye-eun | In-hee |
| Bae Sung-woo | Seung-ho |
| Ahn Seung-gyun | Kyeong-bong |
| Kang Mal-geum | Min-sook |
| Kim Kyu-seon | Professor of Western Music History |
| Im Sung-jae | Go-tae |
| Kong Hyun-ji | Conductor |
| Bang Ye-in | In-hee's Friend 2 |
| Seo Ju-hyeong | Assistant Instructor |
| Kang Kyung-hun | Yeon-seo |
Crew
| Kim Ji-ae | Original Music Composer |
| Chung Hae-suk | Co-Executive Producer |
| Park Hyun-jin | Digital Intermediate |
| Jay Chou | Original Film Writer |
| Kim Min-hye | Production Design |
| Jeong Yi-jin | Conceptual Design |
| Seo You-min | Director |
| William Kim | Producer |
| Shin Eun-kyung | Writer |
| Kim Hyung-joo | Editor |
| Jeon Min-kyoo | Visual Effects Supervisor |
| Yang Hyun-suk | Director of Photography |
| Kim Jun-seong | Original Music Composer |
| Christine To Chi-Long | Original Film Writer |
| Cho Min-ho | Sound Recordist |
| Seong So-won | Makeup & Hair |
| Patrick Park | Line Producer |
| Jay Chou | Songs |
| Seo You-min | Writer |
| Kim Hwan-chul | Co-Executive Producer |
| Choi Pyung-ho | Executive Producer |
| Park Yong-ki | Sound Supervisor |
| Seo Eun-kyung | Costume Design |
| Hong Soo-hee | Costume Design |
| Yoo Seung-hee | Writer |
| Jeon Min-kyoo | Visual Effects Supervisor |
| Kim Hwan-chul | Co-Executive Producer |
| Park Hyun-jin | Digital Intermediate |
| Kim Min-hye | Production Design |
| Jeong Yi-jin | Conceptual Design |
| Park Yong-ki | Sound Supervisor |
| Cho Min-ho | Sound Recordist |
| Patrick Park | Line Producer |
| Seong So-won | Makeup & Hair |
| Yang Hyun-suk | Director of Photography |
| Chung Hae-suk | Co-Executive Producer |
| Jay Chou | Original Film Writer |
| Christine To Chi-Long | Original Film Writer |
| Choi Pyung-ho | Executive Producer |
| William Kim | Producer |
| Kim Hyung-joo | Editor |
| Yoo Seung-hee | Writer |
| Shin Eun-kyung | Writer |
| Seo You-min | Director |
| Kim Jun-seong | Original Music Composer |
| Kim Ji-ae | Original Music Composer |
| Hong Soo-hee | Costume Design |
| Seo Eun-kyung | Costume Design |
| Seo You-min | Writer |
| Jay Chou | Songs |