L'incroyable Mr. Go

Xu Jiao

Weiwei

Sung Dong-il

Sung Choong-Soo

Kim Kang-woo

Baseball Team Director

Kim Jung-tae

Rival Baseball Team Director

Joe Odagiri

Owner of Baseball Team Junichi Ito

Kim Hee-won

Loan Shark

Kim Eung-soo

KBO Commissioner

Byun Hee-bong

Weiwei's Grandfather

Kim Ji-young

Young Weiwei

Ko Chang-seok

Detective So

Ma Dong-seok

Caster

Kim Jung-eun

Jung-eun

Kim Heung-rae

Mr. Go

Jo Jae-yun

Orthopedic Doctor (non-crédité)

Jeong In-gi

Gong In-gu (non-crédité)

Jung Ji-yoon

Show Host