Pemeran Study Group

Hwang Min Hyun (황민현)

as Yun Ga Min

Pemeran Utama

Han Ji Eun (한지은)

as Lee Han Gyeong

Pemeran Utama

Cha Woo Min

as Pi Han Ul

Pemeran Utama

Lee Jong Hyun

as Kim Se Hyeon

Pemeran Utama

Shin Su Hyun

as Lee Ji U

Pemeran Utama

Yoon Sang Jung

as Choi Hui Won

Pemeran Utama

Gong Do Yu

as Lee Jun

Pemeran Utama

Ju Yeon U

as Kim Sun Cheol

Pemeran Pembantu

Baek Seo Hoo

as Ma Min Hwan [Yeonbaek Gang]

Pemeran Pembantu

Hong Min Gi

as Park Geon Yeop [1st year student]

Pemeran Pembantu

Jung Jae Sung

as [Vice-principal]

Pemeran Pembantu

Shim Yoon Bo

as Na Tae Man [Detective]

Pemeran Pembantu

Kim Hwi Gyu

as No. 173

Pemeran Pembantu

Ri Min

as [Dean of students]

Pemeran Pembantu

Jin Woo Jin

as Kim Gyu Jin [Disciplinary Committee member]

Pemeran Pembantu

Seo Min Je

as Kang Tae O

Pemeran Pembantu

Lee Jung Hyuk

as Pi Yeon Baek (Ep. 1)

Bintang Tamu

Kang Du Hyun

as [Student] (Ep. 1)

Bintang Tamu

Yang Joon Seok

as [Student] (Ep. 1)

Bintang Tamu

Song Won Su

as [Security guard] (Ep. 2 )

Bintang Tamu

Kim Min Ah

as Hwang Mi Hui (Ep. 3)

Bintang Tamu

Lee Nam Gyeong

as Lee Ji U [Child] (Ep. 3)

Bintang Tamu

Jo Yi Hyun

as Lee Hyeon U [Child] (Ep. 3)

Bintang Tamu

Kim Dong Gyun

as Hwang Do Gyun (Ep. 4)

Bintang Tamu

Kang Ji Yong

as Lee Jun [Child] (Ep. 4)

Bintang Tamu

Cho Yi An

as Anti [Young teen] (Ep. 4)

Bintang Tamu

Song Seung Hwan

as Lee Jun [Teen] (Ep. 4)

Bintang Tamu

Kim Min

as O Jang Ho [Yeonbaek Gang] (Ep. 4)

Bintang Tamu

Shin Seo Woo

as Kim Se Hyeon [Child] (Ep. 4-5)

Bintang Tamu

Dok Ko Kwang

as [Pedestrian thug] (Ep. 4)

Bintang Tamu

Lee Chang In

as Nam Sang U (Ep. 4-5)

Bintang Tamu

Ma Hyun Ji

as Hong Jae Hui (Ep. 4-5)

Bintang Tamu

Seo In Geol

as Jang Bi Hwan (Ep. 4, 7)

Bintang Tamu

Mo Geon Hu

as Kook Gwan U [Black warehouse 1st grade] (Ep. 4, 7)

Bintang Tamu

Kim Jung Young

as O Jeong Hwa [Former teacher] (Ep. 4, 9-10)

Bintang Tamu

Lim Ji Sub

as Anti (Ep. 4, 10)

Bintang Tamu

Lee Ung Jae

as Yoo Jun Min (Ep. 5)

Bintang Tamu

Lee Keun Wook

as Kang Dong Su (Ep. 5)

Bintang Tamu

Lee Dong Gi

as Eom Seok Dae (Ep. 5)

Bintang Tamu

Choi Ye Chan

as Kim Ho Min [Child] (Ep. 5)

Bintang Tamu

Kyung Ki Hyun

as [Delinquent] (Ep. 5)

Bintang Tamu

Lee Jae Yong

as [Delinquent] (Ep. 5)

Bintang Tamu

Jo Seung Yun

as [Dean of academic affairs] (Ep. 5, 9-10)

Bintang Tamu

Yang Hee Woo

as [Driver] (Ep. 6)

Bintang Tamu

Kim Min Chae

as [Real estate agent] (Ep. 6)

Bintang Tamu

Ko Gyeong Man

as [Hospital employee] (Ep. 7)

Bintang Tamu

Kang Yoon

as Chae Seon Ho (Ep. 7-8)

Bintang Tamu

Park Jae Hwi

as Kim Jae Seung (Ep. 7-8)

Bintang Tamu

Kim Nak Gyun

as Chu Seong Wung (Ep. 7-8)

Bintang Tamu

Jeon Moo Song

as [Sun Cheol’s grandfather] (Ep. 7-8)

Bintang Tamu

Oh Han Kyul

as Park Geon Yeop [Child] (Ep. 9)

Bintang Tamu

Seo Soo Min

as [Student] (Ep. 9)

Bintang Tamu

Ma Jung Pil

as [Hui Won’s dad] (Ep. 9)

Bintang Tamu

Kim Mi Ra

as [Hui Won’s mother] (Ep. 9)

Bintang Tamu

Park Jin

as Bang Sang In (Ep. 9-10)

Bintang Tamu

Kang Ji Hoon

as [Anchorman] (Ep. 9-10)

Bintang Tamu

Park Jun Hyuk

as Anti [Teen] (Ep. 10)

Bintang Tamu

Lee Jong Wook

as Park Jung Nam

Bintang Tamu

Park Jung Hoon

as Heo Jeong Min

Bintang Tamu

Choi Seung Hoon

as Yun Ga Min [Teen]

Bintang Tamu

Jang Sun Yool

as Yun Ga Min [Child]

Bintang Tamu

Han Jung Hoon

as Park Min Cheol [3rd student]

Bintang Tamu

Park Jun Woo

as [Bully]

Bintang Tamu

Shin Min Soo

as [Custodian]

Bintang Tamu

Jang Eui Don

as [Superintendent]

Bintang Tamu

Lee Young Joon

as [Yusung tech student]

Bintang Tamu

Seo Dong Gyu

as [Yusung tech student]

Bintang Tamu

Lim Su Hwan

as [Secretary] (Ep. 9-10)

Bintang Tamu

Kim Sung Ho

as [Guard] (Ep. 7-8)

Bintang Tamu

Jang Joo Young

as Kim Ho Min

Bintang Tamu

Lee Jang Hoon

Sutradara

Oh Bo Hyun

Screenwriter

Yoo In Soo (유인수)

as Chu Jae Hwang [Student] (Ep. 9-10)

Cameo