Bae Doo-na
— Ok Taek-seon
Kim Yoon-seok
— Lee Gyun
장기하
— Kim Yeon-woo
Son Suk-ku
— Nam Su-pil
Seong-kun Mun
— Professor Seong
Hee-won Kim
— Director of Research Institute
Oh Hyun-kyung
— Young-hee
민진웅
— Jeong-hun
Yeom Hye-ran
— Ms. Yeom
유순웅
— Na Jeong-bae
이경진
— Taek-seon's Mother
최형인
— Gyun's Mother
Kim Ye-won
— Ji-seon
Hee-bon Park
— Yi-ju
곽민호
— Manager Kim
Hong Seok-bin
— Doctor 1
김경일
— Doctor 2
Cha Si-won
— Cop 1
카더가든
— Cop 2
이남경
— Young Taek-seon