Jhoon Rhee should have made more martial arts films as he is one of the top practioneers of his style, Tae Kwon Do. He was one of a few people who taught Bruce Lee high kicks.
Even so, this Asian movie from 1973 is a solid one. Most of the time in an Asian production, the fight sequences are speeded up and ridiculously so. "When Tae Kwon Do Strikes" is a bit different, as the choreography is executed in real time. In my opinion, this doesn't detract from the film's entertainment.
I have been watching martial arts films for about 30 years but I hadn't heard of the above film until 2 years ago. It was worth the wait though.