Overview
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.
Cast
- Choi Min-sik as Ri Hak-sung
- Kim Dong-hwi as Han Ji-woo
- Park Hae-joon as Ahn Gi-chul
- Park Byung-eun as Kim Geun-ho
- Jo Yoon-seo as Park Bo-ram
- Tang Joon-sang as Tae-yeon
- Kim Won-hae as Park Pil-joo
- Ju Jin-mo as Professor Oh
- Kim Hee-jung as Bo-ram's Mother
- Kang Mal-geum as Ji-woo's Mother