99 Daejang

The protagonist, Na Seon-Uk, was born with the heart of a tiger. He was a troublemaker, but at the request of his parents, he hid his strength and transferred to Gukyang High School, located in a remote area that he thought would be quiet. However, it was a place where various old-fashioned cultures and dangerous people gathered. Seon-Uk, who wanted to graduate quietly, couldn’t help but feel his hot blood and began educating people!

(Source: KakaoPage, translated)