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 , Park Byung-eun , Jo Yoon-seo , Tang Joon-sang , Kim Won-hae , Ju Jin-mo , Kim Hee-jung , Kang Mal-geum
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