Pemeran Black Dog

Seo Hyun Jin (서현진)

as Go Ha Neul

Pemeran Utama

Ra Mi Ran

as Park Sung Soon

Pemeran Utama

Ha Jun (하준)

as Do Yeon Woo

Pemeran Utama

Lee Chang Hoon

as Bae Myung Soo

Pemeran Utama

Jung Hae Kyun

as Moon Soo Ho

Pemeran Pembantu

Jo Yun Hee

as Kim Yi Boon

Pemeran Pembantu

Kang Shin Ha

as Ji Yoo Sung [Teacher / Administration Department]

Pemeran Pembantu

Jang Da Kyung

as Shim Gi Joo [Teacher / Administration Department]

Pemeran Pembantu

Park Ya Sung

as Park Jung Min [Teacher / Administration Department]

Pemeran Pembantu

Park Ji Hwan

as Song Yeong Tae [3rd Grade senior teacher / Head of Senior Class Group]

Pemeran Pembantu

Heo Tae Hee

as Ha Su Hyeon [Korean teacher / Senior Class Group]

Pemeran Pembantu

Yoo Min Kyu

as Ji Hae Won [Short-term teacher / Senior Class Group]

Pemeran Pembantu

Lee Sae Ro Mi

as Eun Young [Teacher / Senior Class Group]

Pemeran Pembantu

Ahn Sang Eun

as Jang Hee Soo [Short-term teacher / Jae Ho's niece / Senior Class Group]

Pemeran Pembantu

Lee Jang Won

as Son Dong Ha [After school program head teacher and geographic teacher]

Pemeran Pembantu

Lim Hyun Sung

as Yoo Jae Ho [Director of administration]

Pemeran Pembantu

Lee So Jin

as Lee So Jin [Administration office]

Pemeran Pembantu

Kim Hong Pa

as Byun Sung Joo [Principal of Daechi high school]

Pemeran Pembantu

Lee Yoon Hee

as Lee Seung Taek [Vice principal of Daechi high school]

Pemeran Pembantu

Ye Soo Jung

as Yoon Yeo Hwa [Career consultant teacher]

Pemeran Pembantu

Woo Mi Hwa

as Han Jae Hee [Math and creative experience teacher]

Pemeran Pembantu

Kim Seung Hoon

as Cha Tae Ho [Director of Information mathematics and orthodoxy]

Pemeran Pembantu

Park Ji Hoon

as Goo Jae Hyun [Student in Ha Neul's class]

Pemeran Pembantu

Lee Eun Saem

as Jin Yoo Ra [Student in Ha Neul's class]

Pemeran Pembantu

Jung Taek Hyun

as Hwang Bo Tong [Student in Ha Neul's class]

Pemeran Pembantu

Lee Hang Na

as Song Young Sook

Pemeran Pembantu

Kim Jung Young

as Moon So Nyeo

Pemeran Pembantu

Maeng Sang Hoon

as Go Sung Chul

Pemeran Pembantu

Kim Hak Seon

as Yeo Se Chang [Sung Soon's husband]

Pemeran Pembantu

Noh Yi Han

as Yeo Ha Rang [Sung Soon's son]

Pemeran Pembantu

Lee Dong Gyu (이동규)

as Kim Kyung Min [Gangnam High School admissions]

Pemeran Pembantu

Lee Jae Sung

as Lee Chan Young

Pemeran Pembantu

Baek Seo Yun

as Go Ha Neul [11-years-old]

Bintang Tamu

Tae In Ho

as Kim Young Ha

Bintang Tamu

Lee Hyun Kyun

as [Ha Neul's high school teacher] (Ep.1)

Bintang Tamu

Kil Hae Yeon

as [Yeong Ha's mother] (Ep. 1)

Bintang Tamu

Ok Joo Ri

as [Store owner] (Ep. 1)

Bintang Tamu

Kwon So Hyun

as Song Ji Sun [Korean language teacher] (Ep.1-5, 16)

Bintang Tamu

Seo Jung Yeon

as [Ji Yun's mom] (Ep.2)

Bintang Tamu

Kim Jung Soo

as Principal Gang [High school principal] (Ep.3)

Bintang Tamu

Park Jin Yeong

as [High school principal] (Ep. 3)

Bintang Tamu

Yoo Young Bok

as [Gangnam High school principal] (Ep.3)

Bintang Tamu

Choi Min

as Han Se Wol (Ep. 3-4)

Bintang Tamu

Jo Young Seon

as Park Sung Soon [Teen] (Ep.4)

Bintang Tamu

Baek Eun Hye

as Song Chan Hee [Administration officer] (Ep.5, 8-9)

Bintang Tamu

Lee Jung Hoon

as [Jae Hyun's father] (Ep.5-6, 9-10)

Bintang Tamu

Kim Byung Chun

as Park Young Suk [Korean teacher] (Ep.7-8)

Bintang Tamu

Han Song Ho

as [Reporter] (Ep.10-11)

Bintang Tamu

Kim Jong Gu

as [Chairman of Daechi High School] (Ep. 12)

Bintang Tamu

Eun Seo Yool

as Jung Da Hyun [New Teacher] (Ep.12-14)

Bintang Tamu

Park Yoo Rim

as Ryu Jin Hee [New Teacher] (Ep.13)

Bintang Tamu

Seo Hye Jin

as [Ha Rang's teacher] (Ep.13)

Bintang Tamu

Jo Yeong Jin

as [Bo Tong's father] (Ep.15)

Bintang Tamu

Ahn Soo Bin

as [Ha Neul's acquaintance] (Ep. 15-16)

Bintang Tamu

Ahn So Rim

as Yang Da Sol

Bintang Tamu

Lee Haeng Seok

as Mr. Joon Suk [Teacher]

Bintang Tamu

Han Hye Ji

as [Teacher]

Bintang Tamu

Jang Eui Don

as [Dean of students]

Bintang Tamu

Min Sang Woo

as [School Administration employee]

Bintang Tamu

Kyung Ki Hyun

as [Student]

Bintang Tamu

Richard Kim

as [School Guard]

Bintang Tamu

Chu Yeon Gyu

as [Private institute teacher] (Ep.5)

Bintang Tamu

Han Ji Eun

as [Teacher]

Bintang Tamu

Lim Jung Min

Bintang Tamu

Park Se Hoon

as [Police officer #1]

Bintang Tamu

Ryu In A

as Go Ha Neul [Teen]

Bintang Tamu

Hwang Sun Young

as [Nutritionist]

Bintang Tamu

Kwak Na Yeon

as [Parent]

Bintang Tamu

Hwang Bo Kwon

as [Consulting man]

Bintang Tamu

Jang Ho Joon

as [Student] (Ep. 14)

Bintang Tamu

Kim Jong Ho

as [Teacher]

Bintang Tamu

Oh Se Eun

as [Student] (Ep. 6)

Bintang Tamu

Lee Kyung Oh

as [Student's father]

Bintang Tamu

Kim Mi Hye

as Ha Mi Hye (Ep. 1)

Bintang Tamu

Park So Young

as [Staff]

Bintang Tamu

Kim I San

as [Admission officer]

Bintang Tamu

Jeon Mi Do

as [College Admission Officer] (Ep.5)

Bintang Tamu

Park Mi Sae

as In Hyeon Bin

Bintang Tamu

Kang Sung Chan

as [High school student]

Bintang Tamu

Kim Kyung Min

as In Hyun Bin

Bintang Tamu

Hwang Joon Hyuk

Sutradara

Steve M. Choe

Editor

Park Joo Yun

Screenwriter

Hwang Hyun Jeong

Bit part