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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.
Character :Ri Hak-sung
Character :Han Ji-woo
Character :Ahn Gi-chul
Character :Kim Geun-ho
Character :Park Bo-ram
Character :Tae-yeon
Character :Park Pil-joo
Character :Professor Oh
Character :Bo-ram's Mother
Character :Ji-woo's Mother
Character :Korean Teacher
Character :NIS Agent
Character :Student 5
Character :Ui-joon
Character :Principal
Character :Hanbok Teacher
Character :Ddal-bong
