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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Ri Hak-sung
Han Ji-woo
Ahn Gi-chul
Kim Geun-ho
Park Bo-ram
Tae-yeon
Park Pil-joo
Professor Oh
Bo-ram's Mother
Ji-woo's Mother
Korean Teacher
NIS Agent
