Your Letter
1h 38m·
After summer vacation, So-ri transfers to a new school and finds an anonymous letter in her desk drawer with an introduction to the school and a clue to finding the next letter. While following the clues in the letters and searching all over the school like on a treasure hunt, So-ri keeps running into a same-aged student named Dong-soon. So-ri and Dong-soon quickly become friends as they search for the letters together. As she finds one letter after another, the special connection continues, and So-ri's curiosity grows for the mysterious sender.
| Actor | Role |
|---|---|
 Lee Su-hyunLee So-ri (voice) | Lee So-ri (voice) |
 Kim Min-juPark Dong-soon (voice) | Park Dong-soon (voice) |
 Min Seung-wooJung Ho-yeon (voice) | Jung Ho-yeon (voice) |
 Nam Doh-hyeongAhn Seung-kyu (voice) | Ahn Seung-kyu (voice) |
 Kim Yeon-wooKim Ji-min (voice) | Kim Ji-min (voice) |
| LLee Mi-naKim Sunny / Lee Su-kyung (voice) | Kim Sunny / Lee Su-kyung (voice) |
| KKim Chae-rinCho Ho-ran (voice) | Cho Ho-ran (voice) |
| KKim Yea-limYang Song-hee (voice) | Yang Song-hee (voice) |
 Kim A-rongYoung Lee So-ri (voice) | Young Lee So-ri (voice) |
| LLee SerenaYoung Jung Ho-yeon (voice) | Young Jung Ho-yeon (voice) |
| PPark Ki-wookLee So-ri's Father (voice) | Lee So-ri's Father (voice) |
| KKim Soon-miDoctor (voice) | Doctor (voice) |
 Kim Hyeon-ukJersey (voice) | Jersey (voice) |
| WWon Jong-junMask (voice) | Mask (voice) |
| CChoi Hyun-sikBully from Hanwol Middle School (voice) | Bully from Hanwol Middle School (voice) |