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.
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8/10Rating on TMDBFrom The Movie Database58 votes
Choi Min-sikRi Hak-sung
Kim Dong-hwiHan Ji-woo
Park Hae-joonAhn Gi-chul
Park Byung-eunKim Geun-ho
Jo Yoon-seoPark Bo-ram
Tang Joon-sangTae-yeon
Kim Won-haePark Pil-joo
Ju Jin-moProfessor Oh
Kim Hee-jungBo-ram's Mother
Kang Mal-geumJi-woo's Mother
Joo Ye-rinKorean Teacher
Jung Seung-kilNIS Agent
Shin Jae-whiStudent 5
Kang Jun-kyuUi-joon
Kim So-sukPrincipal
