In Our Prime

Ji-woo, an outcast at a prestigious private school, meets Hak-sung, the school janitor who is actually a mathematical genius who defected from North Korea.

• 
  Park Dong-hun

• 
  Choi Min-sik
  Ri Hak-sung
• 
  Kim Dong-hwi
  Han Ji-woo
• 
  Park Hae-joon
  Ahn Gi-chul
• 
  Park Byung-eun
  Kim Geun-ho
• 
  Jo Yoon-seo
  Park Bo-ram
• 
  Tang Joon-sang
  Tae-yeon
• 
  Kim Won-hae
  Park Pil-joo
• 
  Ju Jin-mo
  Professor Oh
• 
  Kim Hee-jung
  Bo-ram's Mother
• 
  Kang Mal-geum
  Ji-woo's Mother
• 
  Joo Ye-rin
  Korean Teacher
• 
  Jung Seung-kil
  NIS Agent
• 
  Shin Jae-whi
  Student 5
• 
  Kang Jun-kyu
  Ui-joon
• 
  Kim So-suk
  Principal
• 
  Choi Jae-sup
  Hanbok Teacher
• 
  Ro Jong-hyun
  Ddal-bong
• 
  Shin Mi-yeong
  Missionary
• 
  Lee Si-woo
  Young Professor Oh