After the unusual attack on a school 'flower boy', Sung-min, on February 14, the same attacks begin to happen at different high schools on every month of the same day. Rumors say that the next victims will be at Neulparan High School.
| Directing | Lee Kwon | Director |
| Production | Lim Ji-young | Producer |
| Production | An Eun-mi | Co-Producer |
| Production | Choi Yong-bae | Executive Producer |
| Production | Lee Soo-man | Executive Producer |
| Writing | Park Yeon-seon | Writer |
| Writing | Lee Kwon | Storyboard |
| Lighting | Chu In-sik | Lighting Director |
| Art | Song Hye-jin | Production Design |
| Production | Park Ji-sung | Executive Producer |
| Sound | Jung Gun | Production Sound Mixer |
| Visual Effects | Hong Jang-pyo | Special Effects Supervisor |
| Editing | Sung Su-ah | Editor |
| Sound | Kim Bong-soo | Sound Supervisor |
| Directing | Eo Jeong-il | Assistant Director |
