Ryoo Seung-bum as Yoon Seok-woo

Go Joon-hee as Kim Yoo-mi / Weathercaster

Park Hae-il as RU-4 / In-myoung (voice)

Kim Kang-woo as Robot Repairman Park Do-won

Bae Doona as Park Min-seo

Bong Joon Ho as Lee Joon-ho

Jin Ji-hee as Young Park Min-seo

John D. Kim as Former NASA Researcher

Don Lee as High School Zombie

Kim Gyu-ri as Bodhisattva Hye-joo

Jo Yoon-hee as Ji-eun

Jung Woo as Joong-dong

Kim Moo-yul as Ji-ho

Yoon Se-a as Min-seo's Mother

Song Sae-byuk as Hwan

Lee Seung-joon as Dad

Kim Seo-hyung as Robot Scientist Min Yoo-ni

Song Young-chang as Co. President Kang

Choi Gwi-hwa as Removal Team

Ryu Seung-su as Announcer

Lee Young-eun as Announcer

Kim Roi-ha as Seok-woo's Father

Lee Kan-hee as Seok-woo's Mother

Hwang Hyo-eun as Seok-woo's Sister

Yoon Je-moon as Joo Je-moon

Kim Su-nam as Monk

Choi Deok-moon as Chief

Kim Kyung-ik as AD Notebook Moderator

Lee Bong-gyu as Senior Monk

Jung Jae-jin as Spiritual Leader

Choe Dae-Hun as Seg. Heavenly Creature - Monk