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A high school student turns to a mathematician who defected from North Korea for help. Han Ji-woo is a senior at an elite school with a special program, which usually accepts children of wealthy parents. Although the boy himself is from a poor family and got here thanks to his excellent academic performance, the local math program is difficult for him. One day, because of a stupid prank, Ji-woo is expelled from the dorm for a month, and, deciding not to upset his mother, the boy asks to live in the closet of an elderly school security guard - a defector from the North, whom the guys nicknamed the Communist Officer. And when Ji-woo finds out that he is good at solving the most difficult math problems, he persuades the Communist Officer to become his tutor. Starring: Kim Dong-hwi Choi Min-sik Cho Yoon-seo Park Hae-joon Park Byung-eun Kim Hee-jeong Kang Mal-geum Noh Jong-hyun Chu Jin-mo Kim Won-hae