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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.

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Cast

• 
  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

Crew

• Director · Park Dong-hun
• Producer · Hwang Jae-soon