Yeon Shi-eun is a model student, who ranks at the top at his school. Physically, he appears like a weak boy, but, by using his smarts, tools, and psychology, he fights against violence that takes place inside and outside of his school.
Park Ji-hoon , Choi Hyun-wook , Hong Kyung , Lee Yeon , Shin Seung-ho , Kim Su-gyeom , Yoon Jung-hoon , Hwang Sung-bin , Na Chul
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