จดหมายของยอน

이수현

Lee So-ri (voice)

김민주

Park Dong-soon (voice)

민승우

Jung Ho-yeon (voice)

남도형

Ahn Seung-kyu (voice)

김연우

Kim Ji-min (voice)

Lee Mi-na

Kim Sunny / Lee Su-kyung (voice)

Kim Chae-rin

Cho Ho-ran (voice)

Kim Yea-lim

Yang Song-hee (voice)

김아롱

Young Lee So-ri (voice)

이세레나

Young Jung Ho-yeon (voice)

Park Ki-wook

Lee So-ri's Father (voice)

Kim Soon-mi

Doctor (voice)

김현욱

Jersey (voice)

Won Jong-jun

Mask (voice)

Choi Hyun-sik

Bully from Hanwol Middle School (voice)