Cheonhajeil Mugonggyogwan

The world's greatest master becomes the instructor of students with countless stories?! Seok Won-Cho, the leader of the Demonic Cult, was a monster that surpassed even the Blood Cult. Do you know who killed him? “Ha Mu-Baek.” “But why that story...” “They say he’s coming to our Mengryongdae as an instructor.” … Damn it. It’s over! Ha Mu-Baek, the world’s greatest martial artist who destroyed the Demonic Cult and the Blood Cult. He gets caught up in a power struggle and is appointed as an instructor at a martial arts training institute. He thought he should hide his identity and live quietly, but he’s strangely busy… ? Welcome, is this your first time as a genius idiot instructor?! (Source: Kakaopage, translated)