Three elite North Korean sleeper agents live under cover for so long that they believe their cover stories are their real identities. They are shocked when they are ordered to kill one another or face death at the hands of an elite hit team.
Is Secretly, Greatly on Netflix? Yes! The movie Secretly, Greatly is now on Netflix in the countries listed below.
| Visual Effects | Cho Yong-seok | VFX Supervisor |
| Editing | Lee Gang-hee | Assistant Editor |
| Crew | Park Jung-ryul | Martial Arts Choreographer |
| Directing | Jang Cheol-soo | Director |
| Writing | Hun | Original Story |
| Art | Kim Jong-woo | Production Design |
| Art | Lee Jong-il | Set Decoration |
| Costume & Make-Up | Kim Eun-yeong | Costume Design |
| Writing | Yoon Hong-gi | Screenplay |
| Production | Kim Young-min | Producer |
| Costume & Make-Up | Hyeyeong Lee | Costume Design |
| Costume & Make-Up | Minjeong Lee | Costume Design |
| Costume & Make-Up | Hanna Jeong | Costume Design |
| Writing | Kim Bang-hyun | Screenplay |
| Writing | Lee Yoon-ho | Storyboard |
| Sound | Lee Tae-gyu | Production Sound Mixer |
| Writing | Oh Tae-kyung | Adaptation |
| Production | Seo Yeon | Producer |
| Visual Effects | Shin Yoo-jin | VFX Supervisor |
| Writing | Jang Cheol-soo | Adaptation |
| Production | Kim Bang-hyun | Producer |
| Sound | Han Myung-hwan | Sound Supervisor |
| Sound | Lee Sung-jin | Sound Supervisor |
| Sound | Jang Young-gyu | Original Music Composer |
| Writing | Jo Seok-hyun | Adaptation |
| Directing | Jo Seok-hyun | Assistant Director |
| Sound | Dalpalan | Original Music Composer |
| Production | Shin Pil-soon | Executive Producer |
| Camera | Choi Sang-ho | Director of Photography |
| Art | You Cheong | Props |
| Sound | Jeong Ji-young | Sound Effects Designer |
| Visual Effects | Lee Jeon-hyoung | Senior Visual Effects Supervisor |
| Art | Park Jun-yong | Props |
| Production | Park Gyeong-seo | Line Producer |
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