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.

"A genius mathematician with a hidden past and a needy student given up on math."

Credits

Park Dong-hunDirector

Choi Min-sikRi Hak-sung

Kim Dong-hwiHan Ji-woo

Park Hae-junAhn Gi-chul

Park Byung-eunKim Geun-ho