Best Teacher Baek by Ganjjajang, ORIBORI, S.J LEE [EP 0-17]

link: https://www.webtoons.com/en/action/best-teacher-baek/list?title_no=4153

Once the finest instructor in the Blood Cult, Suryong Baek is killed, only to to wake up in the body of someone who teaches martial arts at a small rural academy. His new body may be weak, but he knows how to fix it, and it’s not the first time that he’s found himself in a body that can’t access its inner power. Curing his body requires money, however, and Suryong decides that becoming the greatest instructor at a top academy is the best way to do it. Since he’ll be up against tough competition, Suryong will have to use everything he’s got to become a teaching superstar.

Rating: 5/5 (I can see this becoming a favorite).