On a live music radio show, a letter arrives from the 23 years in the past. Through the letter, the first love and friendships of five friends are revealed.
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| Directing | Lee Eun-hee | Director |
| Writing | Lee Eun-hee | Screenplay |
| Writing | Han Chang-Hoon | Screenplay |
| Production | Choi Ki-sup | Producer |
| Editing | Kim Hyung-ju | Editor |
| Production | Jeong Mun-gu | Producer |
| Production | Joo Pil-ho | Producer |
| Production | Bang Mi-Jung | Producer |
| Camera | Lee Joon-gyoo | Director of Photography |
| Sound | Lee Ji-soo | Original Music Composer |
| Costume & Make-Up | Lee Jin-suk | Costume Design |
| Art | Lee Hyun-joo | Production Design |
| Writing | Kim Jin-a | Adaptation |
| Writing | Hong Chang-pyo | Adaptation |
| Lighting | Song Jae-wan | Lighting Director |
| Visual Effects | Park Choul-yong | Special Effects Supervisor |
| Sound | Kim Sin-yong | Production Sound Mixer |
| Camera | Ji Sung-yong | Key Grip |
| Visual Effects | Kim Han-jun | VFX Supervisor |
