- Yoo Ah-in
- Ko Gyeong-cheon / Milk Cow (voice)
- Jung Yu-mi
- Il-ho
- Hwang Seok-jeong
- Witch of the North
- Hyeong-yoon Jang
- Black Dog
- Yeon Sang-ho
- Playground Person
- Deok-pyo Hong
- Passerby
- Ryan Bartley
- II-Ho
- Jean Brownell
- Landlady
- Cam Clarke
- Mr. Oh
- Noelle DePaula
- Additional Voices
- Ben Diskin
- Additional Voices
- Daniel J. Edwards
- Milk Cow
- Wayne Grayson
- (voice)
- Catie Harvey
- (voice)
- Melissa Hope
- (voice)
- Eddy Lee
- (voice)
- Erica Lindbeck
- Singers
- Lisa Ortiz
- (voice)
- Michael Allan Schneider
- Additional Voices
- Mike Schneider
- (voice)
- Melissa Schoenberg
- Additional Voices
- Stephanie Sheh
- (voice)
- Shelly Shenoy
- Eun-Jin
- Michael Sinterniklaas
- (voice)
- Doug Stone
- Mr. Byun
- Julie Ann Taylor
- Witch of the North
- Kirk Thornton
- Merlin
- Vic Victorson
- (voice)
- Tom Wayland
- (voice)
