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류덕환 as Nam-woo (voice) |
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공형진 as Jun-ho (voice) |
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안성기 as Kyung-min (voice) |
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배종옥 as Nam-woo's Mother (voice) |
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나문희 as Nam-woo's Grandmother (voice) |
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장항선 as Jun-ho's Father (voice) |
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이병헌 as Adult Nam-woo (voice) |
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이석준 as Office Colleague 1 (voice) |
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이나리 as Sook-i (voice) |
| Directing | Lee Sung-gang | Director |
| Writing | Kang Su-jeong | Writer |
| Writing | Lee Sung-gang | Writer |
| Writing | Seo Mi-ae | Writer |
| Sound | Lee Byung-woo | Original Music Composer |
| Crew | Geun-wook Kwon | Cinematography |
| Writing | Ji-Hoon Hong | Storyboard |
| Sound | Cesar Inserny | Sound Designer |
| Production | 정태성 | Producer |
| Production | Seong-weon Jo | Producer |
| Production | Choi Jae-won | Executive Producer |
| Editing | 박곡지 | Editor |
| Production | Tcha Sung-jai | Executive Producer |
| Production | Cho Seong-won | Executive Producer |
| Production | Carl Macek | Producer |
| Production | John Ledford | Executive Producer |
