Kang-in is de directeur van de overzeese tak van de National Intelligence Service. Hij leidt een team met de beste agenten bij het uitvoeren van geheime missies. Zijn bijnaam is Yaksha, een mens-verslindende geest, omdat hij genadeloos te werk gaat om te krijgen wat hij wil. Op een dag verschijnt aanklager Ji-hoon in zijn leven om het speciale team te onderzoeken. De officier van justitie ontdekt dat Kang-in's team verwikkeld is in een dodelijke oorlog tussen spionnen.
| Sound | Lee Ju-noh | Original Music Composer |
| Writing | Na Hyun | Writer |
| Art | You Cheong | Props |
| Art | Park Jun-yong | Props |
| Art | Kim Deok-du | Set Decoration |
| Costume & Make-Up | Hong Su-hee | Costume Design |
| Costume & Make-Up | Seo Eun-kyung | Costume Design |
| Production | Ok Gwang-hee | Producer |
| Crew | Kwon Gwi-deok | Martial Arts Choreographer |
| Editing | 김상범 | Editor |
| Sound | On Se-woong | Production Sound Mixer |
| Sound | 김창섭 | Sound Supervisor |
| Writing | Ahn Sang-hoon | Writer |
| Camera | Hong Jae-sik | Director of Photography |
| Art | Kim Hee-jin | Production Design |
| Costume & Make-Up | 곽태용 | Special Effects Makeup Artist |
| Lighting | Kim Jae-keun | Lighting Director |
| Production | Ahn Sang-hoon | Executive Producer |
| Costume & Make-Up | Lee Jin-young | Makeup & Hair |
| Visual Effects | 도광섭 | Special Effects Supervisor |
| Production | Kim Do-su | Executive Producer |
| Crew | Lim Hyo-woo | Stunts |
| Editing | Park Jin-ho | Digital Intermediate |
| Costume & Make-Up | 황효균 | Special Effects Makeup Artist |
| Costume & Make-Up | Lee Hee-eun | Special Effects Makeup Artist |
| Crew | Jeong Jin-geun | Stunts |
| Production | Lee Jae-deok | Line Producer |
| Sound | Moon Chul-woo | Sound Designer |
| Crew | Lee Sang-min | Stunts |
| Crew | 박갑진 | Stunts |
| Visual Effects | 박의동 | Visual Effects |
| Visual Effects | Jung Sang-sung | Special Effects Supervisor |
| Camera | Jeong Kyung-hwa | Still Photographer |
| Directing | Na Hyun | Director |
| Visual Effects | 신진 | CGI Director |
