Ryu Deok-hwan
Nam-woo
Ryu Deok-hwan
Nam-woo
Gong Hyung-jin
Jun-ho
Ahn Sung-ki
Kyung-min
Bae Jong-ok
Nam-woo's mother
Na Moon-hee
Nam-woo's grandmother
Jang Hang-seon
Jun-ho's father
Lee Byung-hun
Nam-woo (adult)
Lee Seok-jun
Office Colleague 1
Alejandro Fallick
Nam-woo (English version, voice)
Jay Hickman
Adult Nam-woo (English version, voice)
Clint Bickham
Jun-ho (English version, voice)
Chris Patton
Adult Jun-ho (English version, voice)
Christine McPeters Auten
Nam-woo's mother (English version, voice)
Shelley Calene-Black
Nam-woo's Grandma (English version, voice)
John Swasey
Jun-ho's Father (English version, voice)
Kira Vincent-Davis
Soog-Y (English version, voice)
Andy McAvin
Kyung-min (English version, voice)
Greg Ayres
Additional Voices
Monica Rial
Additional Voices
Kaytha Coker
Additional Voices
Kang Su-jeong
Writer
Lee Sung-gang
Writer
Ji-Hoon Hong
Storyboard
Cesar Inserny
Sound Designer
Geun-wook Kwon
Cinematography
Lee Byung-woo
Original Music Composer
Lee Sung-gang
Director
Seo Mi-ae
Writer
Jay Choi
Executive Producer
Jeong Tae-sung
Producer
Park Gok-ji
Editor
Seong-weon Jo
Producer
Tcha Sung-jai
Executive Producer
Cho Seong-won
Executive Producer
Carl Macek
Director
Carl Macek
Script
Carl Macek
Producer
John Ledford
Executive Producer