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 | Park Song-i | Storyboard |
| Lighting | Hong Seung-chul | Lighting Director |
| Writing | Kang Full | Comic Book |
| Production | Kim Soon-ho | Executive Producer |
| Writing | Ryu Jang-ha | Writer |
| Visual Effects | Kim Gwang-su | Special Effects Supervisor |
| Writing | Jeonghuh Deok-jae | Screenplay |
| Writing | Yoon Jae-geun | Screenplay |
| Costume & Make-Up | Kim Seo-hyeon | Costume Designer |
| Production | Cho Sung-kyu | Producer |
| Directing | Jang Gyu-hyeon | Assistant Director |
| Editing | Moon In-dae | Editor |
| Sound | Kim Yong-mun | Sound |
| Editing | Sungok Kim | Digital Intermediate Colorist |
| Camera | Cho Sang-yun | Director of Photography |
| Art | Hwang In-jun | Production Design |
| Production | Cho Sung-woo | Producer |
| Writing | Son Mi | Screenplay |
| Production | Choi Yong-bae | Co-Producer |
| Sound | Choi Yong-rock | Music |
| Writing | Kim Sae-bom | Writer |
