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Do-yul, son of the world's top assassin organization leader, transfers to a Korean high school!Arriving as a penniless transfer student, Do-yul takes on a request from Dong-gu, a victim of school violence, and starts taking down the surrounding bullies one by one!The story of a man becoming the strongest in the school world!
Seonu Kang, a high school student, single-handedly takes down a group of illegal loan sharks who show up at his house. While being treated at the hospital, he encounters a mysterious man who offers him an invitation to a suspicious secret fighting tournament with a massive cash prize. The prize money is his only hope to save his family. Seonu must survive in the combat ward at all costs! Will he be able to defeat all other fighters and become champion?