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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.
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.
Choi Min-sik , Kim Dong-hwi , Park Hae-jun
Lee Jeong-hyeon
Showbox , Joy Rabbit
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as Ri Hak-sung
as Han Ji-woo
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