A rookie English teacher named Han Gi-tak goes into Byulli Island, a rural island village, to look for a easy money job that will satisfy his resume. Together with experienced math lecturer Jeong Seok of three years, they teach special children who are a challenge.
| Actor | Role |
|---|---|
 Byun Yo-hanHan Gi-tak | Han Gi-tak |
 Gong Seung-yeonJeong-suk | Jeong-suk |
 Park Hee-soonDo-ha | Do-ha |
| SSim Won-cheolPrincipal | Principal |
| LLoren BurgosLochel | Lochel |
| JJeong Yun-sukSang-gu | Sang-gu |
 Kim Hyun-binJung-hee | Jung-hee |
| EEom Chae-yunBong-seon | Bong-seon |
| JJeon Hui-heonNa-ra | Na-ra |
| BByun Min-wooDae-sik | Dae-sik |
| BByun Seung-wooJung-sik | Jung-sik |
| KKim Geon-hyoSo-sik | So-sik |
 Park Kyung-hyeInternet Tutor | Internet Tutor |
 Park Jung-wooTeenager Sang-gu (voice) | Teenager Sang-gu (voice) |
 Shim Won-cheolVice-Principal Village Foreman | Vice-Principal Village Foreman |