A genius mathematician with a hidden past and a needy student given up on math.
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
Sinkhole
Naughty
Stowaway
Limit
Life Is Beautiful
The Prosecutor
Concrete Utopia
Trick or Treat Scooby-Doo!
Unlocked
Piggy
Seeking a Friend for the End of the World
Breakfast at Tiffany's
