Dong-chun, an elementary school student overwhelmed with seven afterschool learning academies, stumbles upon a mysterious bottle of rice wine during a school retreat. As the rice wine ferments and emits strange sounds like Morse code, Dong-chun sets out to unravel its identity and discovers the secrets of the world and the reasons behind her current way of life.
| Actor | Role |
|---|---|
 Park Na-eunKim Dong-chun | Kim Dong-chun |
 Park Hyo-juPark Hye-jin | Park Hye-jin |
 Kim Hie-wonPark Young-jin | Park Young-jin |
 Kim Ji-hoonKim Goo-po | Kim Goo-po |
| JJeon Young-sooSoong-yi (voice) | Soong-yi (voice) |
| HHan OnewLee Na-young | Lee Na-young |
 Bae Yu-ramLecturer | Lecturer |
 Oh Tae-kyungMC | MC |
 Lee Jae-inPassenger | Passenger |
 Lee Yo-seobAfter-school instructor | After-school instructor |
 Jeong Jong-yeolLee Jun-goo | Lee Jun-goo |
 Yoo Jong-yeonMember | Member |
 Lim Jae-minPersian Language Judge | Persian Language Judge |
 Kim Bong-heeOld woman | Old woman |
 Lee Dong-chanDrunken | Drunken |
 Shin Kang-kyunDrunken | Drunken |
| LLee Gi-hoonNa-young's father | Na-young's father |
| LLee Ha-yoolChild Giving a Presentation | Child Giving a Presentation |