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.

• 
  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