'Diary Film' tells the story of a group of 8 people from different backgrounds who, for various different reasons, come together to follow the same dream: music.
| Actor | Role |
|---|---|
 Kim Hong-joongHimself | Himself |
 Park Seong-hwaHimself | Himself |
 Jeong Yun-hoHimself | Himself |
 Kang Yeo-sangHimself | Himself |
 Choi SanHimself | Himself |
 Song Min-giHimself | Himself |
 Jung Woo-youngHimself | Himself |
 Choi Jong-hoHimself | Himself |