Teach You a Lesson

Director

• 
  Hong Jong Chan

Screenwriter

• 
  Lee Nam Gyu

Main Role

• 
  Kim Moo Yul

  Na Hwa Jin

  Main Role
• 
  Lee Sung Min

  Choi Gang Seok

  Main Role
• 
  Jin Ki Joo

  Im Han Rim

  Main Role
• 
  P.O

  Bong Geun Dae

  Main Role

Support Role

• 
  Kim Jong Soo

  Hwang Gi Tae [Assemblyman]

  Support Role
• 
  Lee Bong Joon

  Cho Gyu Cheol [Ga Yun's student]

  Support Role
• 
  Ha Young

  Choi Ga Yun [Hwa Jin's fiancee]

  Support Role
• 
  Kim Byung Chun

  Lee Cheol Myeon [Gi Tae's close associate]

  Support Role

Guest Role

• 
  Kim Eun Seok

  Kim Eun Cheol [Principal] (Ep. 1)

  Guest Role
• 
  Kim Do Geon

  Kim Gwang Su [Jun Hyeong' right-hand man] (Ep. 1)

  Guest Role
• 
  Jeong Soo Hyun

  Park Dae Seok [Student] (Ep. 1)

  Guest Role
• 
  Lee Seung Gyu

  Ryu Jun Hyeong [Gwang Pil's son] (Ep. 1)

  Guest Role
• 
  Song Young Gyu

  Ryu Gwang Pil [Jun Hyeong's father] (Ep. 1)

  Guest Role
• 
  Jeon Kwang Jin

  [Teacher] (Ep. 1)

  Guest Role
• 
  Kwak Kyoung Hwa

  [Teacher] (Ep. 1)

  Guest Role
• 
  Park Wan Kyu

  [Dae Seok’s father] (Ep. 1)

  Guest Role
• 
  Choi In Sun

  [Subsitute teacher] (Ep. 1)

  Guest Role
• 
  Jin Shi Won

  [Reporter] (Ep. 1-2)

  Guest Role
• 
  Kim Chan Hyung

  Du Mok (Ep. 2)

  Guest Role
• 
  Lee Kwang Hee

  Lee Gwang Hui [Guun Hitech high's student] (Ep. 2)

  Guest Role
• 
  Lee Tae Hwan

  Jang Gwon Hyeok [Guun Hitech high's student] (Ep. 2)

  Guest Role
• 
  Seong No Jin

  [Principal] (Ep. 2)

  Guest Role
• 
  Byun Yoon Jeong

  [Hyeong Ju’s mother] (Ep. 2)

  Guest Role
• 
  Choi Sol Hui

  [Assemblywoman] (Ep. 2-3)

  Guest Role
• 
  Ok Jin Uk

  Cho In Beom [Guun Hitech high's student] (Ep. 2, 4)

  Guest Role
• 
  Jeon Bong Seok

  Kim Hyeong Ju [Guun Hitech high's student] (Ep. 2, 4)

  Guest Role
• 
  Yoo Tae Joo

  Park Seong Hwan [Guun Hitech high's student] (Ep. 2, 4)

  Guest Role
• 
  Seo Dong Hyun

  O Jung Hwan (Ep. 3)

  Guest Role
• 
  Park Bo Bae

  Park Hyeon Ju (Ep. 3)

  Guest Role
• 
  Kwon Hyuk

  Ko Yeong Su [Soyeon girls' high school's teacher] (Ep. 3)

  Guest Role
• 
  Park Yong

  [Principal] (Ep. 3)

  Guest Role
• 
  Jeong Seo Yeon

  [Yeong Su’s wife] (Ep. 3)

  Guest Role
• 
  Lee Si Young

  [Seon Yeong’s friend] (Ep. 3)

  Guest Role
• 
  Park Seo Yoon

  Han Ye Ri [Soyeon girls' high school's student] (Ep. 3-4)

  Guest Role
• 
  Lee Sang Hee

  Jung Seon Yeong [Soyeon girls' high school's teacher] (Ep. 3, 10)

  Guest Role
• 
  Sim Su Bin

  Jung Su Jeong [Student] (Ep. 4)

  Guest Role
• 
  Bae Jun Hyung

  Park Hyeon Ung [Student] (Ep. 4)

  Guest Role
• 
  Kim Seon Hwa

  Kim Yeong Ran [Su Jeong's mother] (Ep. 4)

  Guest Role
• 
  Choi Duk Moon

  Cheon Sang Yeol [Head of Academic Affairs] (Ep. 4)

  Guest Role
• 
  Han Ki Jang

  [Lawyer] (Ep. 4)

  Guest Role
• 
  Lee Hannury

  [Teacher] (Ep. 4)

  Guest Role
• 
  Lee Seung Jin

  [Teacher] (Ep. 4)

  Guest Role
• 
  Lee So Geum

  [Detective] (Ep. 4)

  Guest Role
• 
  Park Seung Hyun

  [Detective] (Ep. 4)

  Guest Role
• 
  Kim Tae Yoo

  [Institute staff] (Ep. 4)

  Guest Role
• 
  Lee Dong Ho

  [Institute teacher] (Ep. 4)

  Guest Role
• 
  Son Da Yeon

  [Han Rim's classmate] (Ep. 4)

  Guest Role
• 
  Seo Kwang Jae

  [Hearing chairperson] (Ep. 4)

  Guest Role
• 
  Gu Bon Jin

  [Hyeon Ung's father] (Ep. 4)

  Guest Role
• 
  Park Kwan Woo

  [Han Rim's classmate] (Ep. 4)

  Guest Role
• 
  Ok Il Jae

  [Prosecutors' office investigator] (Ep. 4)

  Guest Role
• 
  Baek Ji Hye

  [Gi Tae's assistant] (Ep. 4, 7, 9)

  Guest Role
• 
  Kim Ye Rin

  Yeon Seo (Ep. 5)

  Guest Role
• 
  Jang Hee Jung

  Lee Yeong Mi (Ep. 5)

  Guest Role
• 
  Kang Ji Eun

  Kim Ji Eun [Principal] (Ep. 5)

  Guest Role
• 
  Song Si An

  Choi Ji Seon [Teacher] (Ep. 5)

  Guest Role
• 
  Park Ji Yun

  Lee Ji Yeong [U Jin's mother] (Ep. 5)

  Guest Role
• 
  Kwon Dong Ho

  Kim Seok Hyeon [U Jin's father] (Ep. 5)

  Guest Role
• 
  Choi Ja Woon

  Kim U Jin [Hyeonjung elementary school student] (Ep. 5)

  Guest Role
• 
  Choi E Jun

  [Student] (Ep. 5)

  Guest Role
• 
  Kim Eun Ho

  [Student] (Ep. 5)

  Guest Role
• 
  Park Si Hyeon

  [Student] (Ep. 5)

  Guest Role
• 
  Han So Hyun

  [Bank teller] (Ep. 5)

  Guest Role
• 
  Lee Eun Joo

  [Prosecutor] (Ep. 5)

  Guest Role
• 
  Kim Sung Yong

  [Bank manager] (Ep. 5)

  Guest Role
• 
  Yoon Hyun Gil

  [Ji Seon's mother] (Ep. 5)

  Guest Role
• 
  Lee Ji Hae

  [Seo Jun's mother] (Ep. 5)

  Guest Role
• 
  Han Seon Ae

  [Student's mother] (Ep. 5)

  Guest Role
• 
  Kim Su Yeong

  [Student's mother] (Ep. 5)

  Guest Role
• 
  Choi Young Min

  [Ministry of Education staff] (Ep. 5)

  Guest Role
• 
  Park Gang To

  [Ministry of Education staff] (Ep. 5)

  Guest Role
• 
  Lee Hyung Joo

  Teacher Lee (Ep. 6)

  Guest Role
• 
  Kim Yu Bin

  [Student] (Ep. 6)

  Guest Role
• 
  Eom Ji Man

  [Detective] (Ep. 6)

  Guest Role
• 
  Ahn Chan Woong

  [Detective] (Ep. 6)

  Guest Role
• 
  Bae Seong Il

  [Prison warden] (Ep. 6)

  Guest Role
• 
  Yeo Min Goo

  [Min Su's father] (Ep. 6)

  Guest Role
• 
  Cho Yu Jin

  [Ji Ung's mother] (Ep. 6)

  Guest Role
• 
  Jang Ji Yong

  [Du Hyeon's father] (Ep. 6)

  Guest Role
• 
  Kim Kyun Ha

  Kim Su Gyeom (Ep. 6-7)

  Guest Role
• 
  Do Geon Wu

  Na Jung Hwan (Ep. 6-7)

  Guest Role
• 
  Choi Jae Sub

  Kang Jun Man [Correctional officer] (Ep. 6-7, 9)

  Guest Role
• 
  Jang Yo Hoon

  Min Ji Ung [Four juvenile delinquents' leader] (Ep. 6-7)

  Guest Role
• 
  Bae Jae Young

  Lee Jae Yun [Student] (Ep. 7)

  Guest Role
• 
  Jo Eun Sol

  Sin Ji Su [Illegal gambling site ringleader] (Ep. 7)

  Guest Role
• 
  Seo Hye Min

  [Teacher] (Ep. 7)

  Guest Role
• 
  Choi Joon Kyu

  [Gang member] (Ep. 7)

  Guest Role
• 
  Chun Myung Woo

  [Gang member] (Ep. 7)

  Guest Role
• 
  Jo Hyun Woo

  [Jae Yun's father] (Ep. 7)

  Guest Role
• 
  Lee Seo Won

  [Jae Yun's mother] (Ep. 7)

  Guest Role
• 
  Lee Jae Woong

  [ERPB security guard] (Ep. 7)

  Guest Role
• 
  Kim Tae Young

  Jung Hyeon Min [Student] (Ep. 8)

  Guest Role
• 
  Yoon Young Min

  [Advisor] (Ep. 8)

  Guest Role
• 
  Jo Jae Young

  [Detective] (Ep. 8)

  Guest Role
• 
  Kim Eun Young

  [School nurse] (Ep. 8)

  Guest Role
• 
  Chang Eun A

  [Da Hui's mother] (Ep. 8)

  Guest Role
• 
  Lee Seok Jun

  [Hyeon Min's father] (Ep. 8)

  Guest Role
• 
  Cho Yeon Jin

  [Yeong Jun's mother] (Ep. 8)

  Guest Role
• 
  Seo Young Hee

  [Hyeon Min's mother] (Ep. 8)

  Guest Role
• 
  Uhm Ju Yeon

  Lee Ji Hyo (Ep. 9)

  Guest Role
• 
  Kim Da Hwin

  Attorney Yun (Ep. 9)

  Guest Role
• 
  Park Ji Won

  [Chi Ho's mother] (Ep. 9)

  Guest Role
• 
  Kim Min Suk

  [Parole examiner] (Ep. 9)

  Guest Role
• 
  Jeon Young

  [Seong Gu's mother] (Ep. 9)

  Guest Role
• 
  Jung Jong Yul

  [Committee chairman] (Ep. 9)

  Guest Role
• 
  Kim Kwan Jang

  [Jinwon high school parent] (Ep. 9)

  Guest Role
• 
  Moon Dong Ho

  Seo Jin Hyeok (Ep. 9-10)

  Guest Role
• 
  Lee Seung Noh

  Jung Hyeon Tae (Ep. 9-10)

  Guest Role
• 
  Kim Jae Seon

  Lee Chi Ho [Student] (Ep. 9-10)

  Guest Role
• 
  Lee Woo Je

  Jang Seong Gu [Student] (Ep. 9-10)

  Guest Role
• 
  Lee Ga Yeon

  Ham Yu Ri (Ep. 10)

  Guest Role
• 
  Jeon Seung Hun

  Seo Tae Hun [Bully student] (Ep. 10)

  Guest Role
• 
  Park Jae Hwi

  [Athlete] (Ep. 10)

  Guest Role
• 
  Ha Na Ri

  [Teacher] (Ep. 10)

  Guest Role
• 
  Dok Ko Kwang

  [Teacher] (Ep. 10)

  Guest Role
• 
  Baek Na Gyeong

  [Soyeon high school student] (Ep. 10)

  Guest Role

Cameo

• 
  Mimiminu

  Mimiminu (Ep. 4)

  Cameo