• full movie: https://tubitv.com/movies/100020465/when-taekwondo-strikes (this is where I watched it... I'm sure it's other places too...)
• look for clips on youtube: https://www.youtube.com/results?search_query=when+taekwondo+strikes

Guess who wins this fight.

...a 1973 Hong Kong martial arts film ...The story is about the Korea under Japanese rule during World War II. A Korean nationalist played by Carter Wong gets into a fight with some Japanese people and is chased into a church. The priest there is captured and tortured. Trying to secure his release, the leader of the resistance, Jhoon Rhee is himself captured and tortured by the Japanese. Carter Wong, Angela Mao and Anne Winton have to now try and rescue him. This leads to an explosive climax with the heroes having to fight the likes of Wong In Sik (Hwang In-Shik), Sammo Hung and Kenji Kazama.

Background

Rhee landed the role in the film with help from his friend Bruce Lee whom he met in 1964 while both were performing demonstrations at an international karate event held in Long Beach, California.[3] In 1972, Lee went to Golden Harvest Films boss Raymond Chow with the idea of making a movie about Taekwondo with Rhee in lead role. Rhee who never thought of himself as an actor didn't think it would come to fruition but a year later in the summer of 1973, Rhee was flying to Hong Kong to star in the film which was set in Korea, playing the part of Master Lee, a leader of a group of underground patriots. The plot for the film was based on a synopsis written by Rhee. It didn't take long to produce the film and by 19 July Rhee was back in the United States. This was when Bruce Lee called him to let him know that the film's editing had been done and it was ready for release.[4] Rhee was looking at the possibility of more film work but with Lee's death which was around the film's release and the possibility of being away from his family didn't appeal to him. So this became his first and last film.[5]

https://en.wikipedia.org/wiki/When_Taekwondo_Strikes