Cast & crew
Keys to the Heart (2018)
Directed by Choi Sung-hyun Written by Choi Sung-hyun
Cast
| Yoon Yeong-gyun | Policeman |
| Jung Yun-ha | Keun-bok |
| Jo Kwan-woo | Moon |
| Yoon Young-kyun | Police Officer |
| Kim Sung-ryung | Hong |
| Lee Jun-ha | Bully |
| Youn Yuh-jung | Seo Hye-sook |
| Park Soo-oh | young Bell |
| Han Ji-min | Yool |
| Bek Hyun-jin | Ding Dong |
| Lee Byung-hun | Unis Kim |
| Kim Sang-Wook | |
| Moon Sook | Keun-bok |
| Park So-eun | Mactilburgh's Assistant |
| Park Jeong-min | Tae-suk |
| Oh Hye-won | Keun-bok |
| Park Ji-yeon | Seo Hye-sook |
| Yang Jun-seok | Big Momma |
| Park Ji-hoon | Tae-suk |
| Son Woo-hyuk | Musician Boyfriend |
| Ahn Seong-bong | Sky |
| Lee Zoo-young | Eun-sil |
| Hwang Seok-jeong | Chief |
| Choi Ri | Wan Jung |
Crew
| Kim Gyeong-seok | Lighting Director |
| Kil Young-min | Executive Producer |
| Song Gyeong-seop | Still Photographer |
| Ju Seung-hwan | Producer |
| Choi Sung-hyun | Director |
| Yeom Eun-ha | Line Producer |
| Kim Deok-min | Assistant Director |
| Son Suk-woo | Producer |
| Lee Jin-young | Makeup & Hair |
| Park Eui-dong | Visual Effects |
| Lee Tae-hoon | Production Design |
| JK Youn | Executive Producer |
| Ryu Seong-cheol | Stunts |
| Kim Tae-sung | Director of Photography |
| Choi Jun-ho | Production Supervisor |
| Choi Sung-hyun | Writer |
| Park Hyun-soo | Production Sound Mixer |
| Choi Bong-rock | Fight Choreographer |
| Kim Eun-suk | Costume Design |
| Hwang Sang-jun | Original Music Composer |
| Jang Jin-seung | Executive Producer |
| Lee Jin-hyung | Art Direction |