Pemeran Undercover High School

Seo Kang Jun (서강준)

as Jung Hae Seong / Jung Si Hyeon

Pemeran Utama

Jin Ki Joo (진기주)

as O Su A / O Bong Ja

Pemeran Utama

Kim Shin Rock (김신록)

as Seo Myeong Ju

Pemeran Utama

Jeon Bae Soo

as An Seok Ho [NIS team 4 team leader]

Pemeran Pembantu

Jo Bok Rae

as Ko Yeong Hun [NIS team 4 agent]

Pemeran Pembantu

Yoon Ga Yi

as Park Mi Jeong [NIS team 4 agent]

Pemeran Pembantu

Lee Seo Hwan

as Kim Hyeong Bae [NIS director]

Pemeran Pembantu

Im Chul Hyung

as Kong Jin Sang [NIS team 1 team leader]

Pemeran Pembantu

Kim Min Ju

as Lee Ye Na [Student council president]

Pemeran Pembantu

Park Se Hyun

as An Yu Jeong [Seok Ho’s daughter]

Pemeran Pembantu

Jang Sung Bum

as Park Tae Su [Student council member]

Pemeran Pembantu

Lee Hyun So

as Han Seung Jae [Student council member]

Pemeran Pembantu

Kim Sun Min

as Ji Hyeon Jun [Student council vice president]

Pemeran Pembantu

Shin Jun Hang

as Lee Dong Min [Student]

Pemeran Pembantu

Jeong Soo Hyun

as Im Yun Cheol [Student]

Pemeran Pembantu

Kang Pil Jun

as Son Beom Sik [Student]

Pemeran Pembantu

Shin Ga Eun

as Choi Su Jin [Student]

Pemeran Pembantu

Kim Seung Beom

as Kim Ho Jin [Informant]

Pemeran Pembantu

Park Jin U

as Park Jae Mun [Byeongmun high school president]

Pemeran Pembantu

Oh Yong

as Baek Gwang Do [Superintendent]

Pemeran Pembantu

Lee Min Ji

as Kim Ri An [P.E. teacher]

Pemeran Pembantu

Noh Jong Hyun

as Lee Jun Ho [Math teacher]

Pemeran Pembantu

Yun Chae Bin

as Yun Chae Rin [Student]

Pemeran Pembantu

Kim Eui Sung

as Seo Byeong Mun [Byeongmun high school former principal] (Ep. 1)

Bintang Tamu

Li Yong Qun

as [Blackmarket buyer] (Ep. 1)

Bintang Tamu

Kyung Ki Hyun

as [Restaurant hoodlum] (Ep. 1)

Bintang Tamu

Shin Dam Soo

as Park Min Cheol [Assemblyman] (Ep. 1, 3-4)

Bintang Tamu

Kang Soo Bin

as [Bully student] (Ep. 2)

Bintang Tamu

Jang Se Rim

as [Bully student] (Ep. 2)

Bintang Tamu

Jo Jae Yun (조재윤)

as Koo Sang Tae [Boss] (Ep. 2-4)

Bintang Tamu

Shin Yeon Suk

as Choi Bok Sun [Dong Min’s grandma] (Ep. 2-3)

Bintang Tamu

Koo Min Hyuk

as Kim Hyeon Ho [Security guard] (Ep. 2-3, 5-6)

Bintang Tamu

Yu Ji Wan

as Jung Hae Seong [Child] (Ep. 2, 4-7, 9, 11-12)

Bintang Tamu

Lee Dong Gi

as Kang Seong U [Bully] (Ep. 3)

Bintang Tamu

Yong Jin

as [Detective] (Ep. 3)

Bintang Tamu

Baek Kil Sung

as [Seong U’s dad] (Ep. 3)

Bintang Tamu

Park Jung Eon

as [Student’s mom] (Ep. 3)

Bintang Tamu

Lee Bum Chan

as [Ye Na’s driver] (Ep. 3, 5)

Bintang Tamu

Su Hyun

as [Student] (Ep. 4)

Bintang Tamu

Ahn Nae Sang

as [Neighborhood resident] (Ep. 4)

Bintang Tamu

Park Seol Ha

as O Su A [Child] (Ep. 4-7)

Bintang Tamu

Kwon Tae Won

as Chief editor Yun (Ep. 5)

Bintang Tamu

Kim Sung Yong

as [CCTV room staff] (Ep. 5)

Bintang Tamu

Lee Hwi Seo

as [Piano student] (Ep. 6)

Bintang Tamu

Yoo Dam Yeon

as Ms. Do [Student’s parent] (Ep. 7-8)

Bintang Tamu

Joo Seok Tae

as [Seung Jae’s dad] (Ep. 7-8)

Bintang Tamu

Lee Seo Young

as Park Min Ji [Su A’s student] (Ep. 8, 12)

Bintang Tamu

Kim Dae Geun

as [Gang member] (Ep. 10)

Bintang Tamu

Kim Nak Gyun

as [Internal affairs officer] (Ep. 10)

Bintang Tamu

Chae Hoon

as [Gangster] (Ep. 1)

Bintang Tamu

Choi Jung In

Sutradara

Im Young Bin

Screenwriter