• 
  Cheol-min Lee

   School Principal (7 episodes, 2016)
• 
  Jae-yoon Cho

   History Teacher (7 episodes, 2016)
• 
  Tu-In Tak

   Catcher (7 episodes, 2016)
• 
  Hyeok Seong

   Baseball Coach (7 episodes, 2016)
• 
  Jin-joo Park

   Mathematics Teacher (7 episodes, 2016)
• 
  Se-yoon Moon

   Bus Driver (7 episodes, 2016)
• 
  Jung Shin Lee

   Girls' Home Room Teacher (7 episodes, 2016)
• 
  Chan-Hee Kang

   Kang Chan-hee (7 episodes, 2016)

• 
  Jae-yoon Lee

   Lee Jae-yoon (7 episodes, 2016)
• 
  Do-Yeon Lee

   Teacher (6 episodes, 2016)
• 
  Seol-Hyun Kim

   The School Goddess (7 episodes, 2016)
• 
  Ji-So Park

   Young Kwon Min-ah (7 episodes, 2016)
• 
  Min-ah Kwon

   Kwon Min-ah (7 episodes, 2016)
• 
  Ju-ho Baek

   Baek Ju-ho (6 episodes, 2016)
• 
  Ro-Woon Kim

   Kim Ro-woon (7 episodes, 2016)

• 
  Da-won Lee

   Lee Da-won (7 episodes, 2016)
• 
  Yeong-bin Kim

   Kim Yeong-bin (7 episodes, 2016)
• 
  In-Seong Kim

   Kim In-seong (6 episodes, 2016)
• 
  Tae-Yang Yoo

   Yoo Tae-yang (7 episodes, 2016)
• 
  Hwi-Yeong Kim

   Kim Hwi-yeong (7 episodes, 2016)
• 
  Jin-mok Lee

   Lee, Jin-mok (6 episodes, 2016)
• 
  Hae-Jeong Yoo

   Student (7 episodes, 2016)
• 
  Na-Young Kim

   Miss Kim (7 episodes, 2016)
• 
  Jae-ho Min

  (7 episodes, 2016)
• 
  Hye-Jung Shin

  (7 episodes, 2016)
• 
  Do-Yeon Lee

   Girl on Bus (6 episodes, 2016)
• 
  Hwi-Yeol Kim

   Kim, Hwi-yeol (7 episodes, 2016)
• 
  Gook-joo Lee

   School Nurse (7 episodes, 2016)
• 
  Ji-min Shin

   Desk Buddy (6 episodes, 2016)
• 
  Yu-na Seo

  (7 episodes, 2016)
• 
  Chan-mi Kim

  (7 episodes, 2016)
• 
  Youngbin

  7 episodes, 2016
• 
  Inseong

  7 episodes, 2016
• 
  Jaeyoon

  7 episodes, 2016
• 
  Dawon

  7 episodes, 2016
• 
  Zuho

  7 episodes, 2016
• 
  Yoo Taeyang

  7 episodes, 2016
• 
  Hwiyoung

  7 episodes, 2016
• 
  Chani

  7 episodes, 2016