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
Ri Hak-sung
Kim Dong-hwi
Han Ji-woo
Park Hae-joon
Ahn Gi-chul
Park Byung-eun
Kim Geun-ho
Jo Yoon-seo
Park Bo-ram
Tang Joon-sang
Tae-yeon
Kim Won-hae
Park Pil-joo
Ju Jin-mo
Professor Oh
Kim Hee-jung
Bo-ram's Mother
Kang Mal-geum
Ji-woo's Mother
Joo Ye-rin
Korean Teacher
Jung Seung-kil
NIS Agent
Shin Jae-whi
Student 5
Kang Jun-kyu
Ui-joon
Kim So-suk
Principal
“A genius mathematician with a hidden past and a needy student given up on math.”
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