Yeon Sieun is not interested in anything other than studying, but he does not avoid fighting back if someone provokes a fight. Sieun, who creates an advantageous situation with his super brain and protects himself by using surrounding tools, eventually faces a crisis because he is alone, and at that moment, he is helped by another outsider, Ahn Suho, and a transfer student Oh Beomseok. Strange friendships develop among those who fight alone or together to survive in a jungle-like school.