I had a battalion commander in Korea who had served as an enlisted soldier in Viet Nam. He had some similar stories about ROK discipline. While I never saw anything that dramatic, I did watch a ROK Army rail operation one time (i.e. downloading their artillery pieces off a rail head). The officers walked around with stopwatches and metal rods and they had no problem administering a healthy swat to soldiers who were falling out of synch with the exercise.
I went to talk to one of my ROK radiomen in the bunker at Camp Red Cloud and caught him having relations with another male soldier. I just slid the soundproof door closed again and went to get their sergeant major. He took both of them back into a room with a steel door and commenced to beat them about the head & shouders with a 2 X 4. I never saw either one of them again. Don’t know if he killed them, but it wouldn’t surprise me.