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)