Hwang Jung-min as Superman / Lee Hyun-suk

Jun Ji-hyun as Song Soo-jung

Jin Ji-hee as Hee-jung / Lee Ji-young

Do Yong-gu as Director

Sun Woo-sun as Writer Kim

Kim Jae-rok as Bruce Lee (uncredited)

Park Yong-su as Ph.D Kim (uncredited)

Lee Sang-yeob as Soo-jung's Male Friend (uncredited)

Woo Ki-hong as Police Officer Ha (uncredited)

Jo Hee-bong as Audio Engineer (uncredited)

Jeon Su-ji as Parking Lot Woman (uncredited)

Kang Ae-sim as Red Cross Staff (uncredited)

Park Hyun-young as Nurse (uncredited)

Park Hye-jin as Old Woman