Kwon Yeon-woo is a thirty year old low-level civil servant who works in a district office; quite innocent for his age, he has been on numerous blind dates in an unsuccessful bid to find a wife. After moving into a new place, he begins to encounter a high school girl, Soo-yeong, on his way to work every morning, and she begins to develop feelings for him. Meanwhile, Kang Sook has just started working at the district office straight out of high school, and falls head over heels for older woman Kwon Ha-kyeong.
Unfortunately the movie Hello, Schoolgirl is not yet available on HBO Max.
| Directing | Ryu Jang-ha | Director |
| Writing | Kang Full | Comic Book |
| Writing | Ryu Jang-ha | Writer |
| Writing | Jeonghuh Deok-jae | Screenplay |
| Writing | Yoon Jae-geun | Screenplay |
| Production | Cho Sung-kyu | Producer |
| Sound | Kim Yong-mun | Sound |
| Writing | Kang Full | Screenplay |
| Editing | Moon In-dae | Editor |
| Costume & Make-Up | Kim Seo-hyeon | Costume Designer |
| Camera | Cho Sang-yun | Director of Photography |
| Directing | Jang Gyu-hyeon | Assistant Director |
| Editing | Sungok Kim | Digital Intermediate Colorist |
| Art | Hwang In-jun | Production Design |
| Production | Choi Yong-bae | Co-Producer |
| Production | Cho Sung-woo | Producer |
| Writing | Son Mi | Screenplay |
| Sound | Choi Yong-rock | Music |
| Writing | Kim Sae-bom | Writer |
| Lighting | Hong Seung-chul | Lighting Director |
| Visual Effects | Kim Gwang-su | Special Effects Supervisor |
| Writing | Park Song-i | Storyboard |
| Production | Kim Soon-ho | Executive Producer |
