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.

Cast:Choi Min-sik, Kim Dong-hwi, Park Hae-joon, Park Byung-eun, Jo Yoon-seo, Tang Joon-sang,

Genre:Drama,

country:South Korea,

Production:Joy Rabbit, Showbox,