Black Dog

Director

• 
  Hwang Joon Hyuk

Editor

• 
  Steve M. Choe

Screenwriter

• 
  Park Joo Yun

Main Role

• 
  Seo Hyun Jin

  Go Ha Neul

  Main Role
• 
  Ra Mi Ran

  Park Sung Soon

  Main Role
• 
  Ha Joon

  Do Yeon Woo

  Main Role
• 
  Lee Chang Hoon

  Bae Myung Soo

  Main Role

Support Role

• 
  Jung Hae Kyun

  Moon Soo Ho

  Support Role
• 
  Jo Yun Hee

  Kim Yi Boon

  Support Role
• 
  Kang Shin Ha

  Ji Yoo Sung [Teacher / Administration Department]

  Support Role
• 
  Jang Da Kyung

  Shim Gi Joo [Teacher / Administration Department]

  Support Role
• 
  Park Ya Sung

  Park Jung Min [Teacher / Administration Department]

  Support Role
• 
  Park Ji Hwan

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

  Support Role
• 
  Heo Tae Hee

  Ha Soo Hyun [Korean teacher / Senior Class Group]

  Support Role
• 
  Yoo Min Kyu

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

  Support Role
• 
  Lee Sae Ro Mi

  Eun Young [Teacher / Senior Class Group]

  Support Role
• 
  Ahn Sang Eun

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

  Support Role
• 
  Lee Jang Won

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

  Support Role
• 
  Lim Hyun Sung

  Yoo Jae Ho [Director of administration]

  Support Role
• 
  Lee So Jin

  Lee So Jin [Administration office]

  Support Role
• 
  Kim Hong Pa

  Byun Sung Joo [Principal of Daechi high school]

  Support Role
• 
  Lee Yoon Hee

  Lee Seung Taek [Vice principal of Daechi high school]

  Support Role
• 
  Ye Soo Jung

  Yoon Yeo Hwa [Career consultant teacher]

  Support Role
• 
  Woo Mi Hwa

  Han Jae Hee [Math and creative experience teacher]

  Support Role
• 
  Kim Seung Hoon

  Cha Tae Ho [Director of Information mathematics and orthodoxy]

  Support Role
• 
  Park Ji Hoon

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

  Support Role
• 
  Lee Eun Saem

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

  Support Role
• 
  Jung Taek Hyun

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

  Support Role
• 
  Lee Hang Na

  Song Young Sook

  Support Role
• 
  Kim Jung Young

  Moon So Nyeo

  Support Role
• 
  Maeng Sang Hoon

  Go Sung Chul

  Support Role
• 
  Kim Hak Seon

  Yeo Se Chang [Sung Soon's husband]

  Support Role
• 
  Noh Yi Han

  Yeo Ha Rang [Sung Soon's son]

  Support Role
• 
  Lee Dong Gyu

  Kim Kyung Min [Gangnam High School admissions]

  Support Role
• 
  Lee Jae Sung

  Lee Chan Young

  Support Role

Guest Role

• 
  Baek Seo Yun

  Go Ha Neul [11-years-old]

  Guest Role
• 
  Tae In Ho

  Kim Young Ha

  Guest Role
• 
  Lee Hyun Kyun

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

  Guest Role
• 
  Kil Hae Yeon

  [Young Ha's mother] (Ep. 1)

  Guest Role
• 
  Ok Joo Ri

  [Store owner] (Ep. 1)

  Guest Role
• 
  Kwon So Hyun

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

  Guest Role
• 
  Seo Jung Yeon

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

  Guest Role
• 
  Kim Jung Soo

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

  Guest Role
• 
  Park Jin Yeong

  [High school principal] (Ep. 3)

  Guest Role
• 
  Yoo Young Bok

  [Gangnam High school principal] (Ep.3)

  Guest Role
• 
  Choi Min

  Han Se Wol (Ep. 3-4)

  Guest Role
• 
  Jo Young Seon

  Park Sung Soon [Teen] (Ep.4)

  Guest Role
• 
  Baek Eun Hye

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

  Guest Role
• 
  Lee Jung Hoon

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

  Guest Role
• 
  Kim Byung Chun

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

  Guest Role
• 
  Han Song Ho

  [Reporter] (Ep.10-11)

  Guest Role
• 
  Kim Jong Goo

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

  Guest Role
• 
  Eun Seo Yool

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

  Guest Role
• 
  Park Yoo Rim

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

  Guest Role
• 
  Seo Hye Jin

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

  Guest Role
• 
  Jo Yeong Jin

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

  Guest Role
• 
  Ahn Soo Bin

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

  Guest Role
• 
  Ahn So Rim

  Yang Da Sol

  Guest Role
• 
  Lee Haeng Seok

  Mr. Joon Suk [Teacher]

  Guest Role
• 
  Han Hye Ji

  [Teacher]

  Guest Role
• 
  Jang Eui Don

  [Dean of students]

  Guest Role
• 
  Min Sang Woo

  [School Administration employee]

  Guest Role
• 
  Kyung Ki Hyun

  [Student]

  Guest Role
• 
  Richard Kim

  [School Guard]

  Guest Role
• 
  Chu Yeon Gyu

  [Private institute teacher] (Ep.5)

  Guest Role
• 
  Han Ji Eun

  [Teacher]

  Guest Role
• 
  Lim Jung Min Guest Role
• 
  Park Se Hoon

  [Police officer #1]

  Guest Role
• 
  Ryu In A

  Go Ha Neul [Teen]

  Guest Role
• 
  Hwang Sun Young

  [Nutritionist]

  Guest Role
• 
  Kwak Na Yeon

  [Parent]

  Guest Role
• 
  Hwang Bo Kwon

  [Consulting man]

  Guest Role
• 
  Jang Ho Joon

  [Student] (Ep. 14)

  Guest Role
• 
  Kim Jong Ho

  [Teacher]

  Guest Role
• 
  Oh Se Eun

  [Student] (Ep. 6)

  Guest Role
• 
  Lee Kyung Oh

  [Student's father]

  Guest Role
• 
  Kim Mi Hye

  Ha Mi Hye (Ep. 1)

  Guest Role
• 
  Park So Young

  [Staff]

  Guest Role
• 
  Kim I San

  [Admission officer]

  Guest Role
• 
  Jeon Mi Do

  [College Admission Officer] (Ep.5)

  Guest Role
• 
  Kang Sung Chan

  [High school student]

  Guest Role
• 
  Kim Kyung Min

  In Hyun Bin

  Guest Role
• 
  Park Mi Sae

  In Hyeon Bin

  Guest Role

Unknown

• 
  Shin Ji Yeon Unknown
• 
  So A Rin Unknown
• 
  Han Ji Won Unknown
• 
  Lee Jae In Unknown
• 
  Jung Sang Hyun Unknown
• 
  Park Woo Young Unknown

Bit part

• 
  Hwang Hyun Jeong Bit part