The movie starts with a song. There will be many more songs. Our singer is looking for her father. Jimmy Wang Yu is looking for the man who killed his father. He defends the singer from the protection gang and then ends up working for them. He explains this is his plan to find the killer.
I also watched this on the video CD. I'll add to the other excellent review by commenting on the action. As a fan of martial arts movie of the golden age from 1967 to 1984 I watched this movie because watching all of Jimmy Wang Yu's movies is part of the job. In this movie he is quite the fashion show. I wish the 1970s styles for men's clothing would return. I love the colors and the collars.
Most of the fights are just beatings. Jimmy finishes off almost every opponent with one punch or kick. Ying-Chieh Han (a.k.a. The Big Boss) gives him a bit of a fight. From about the middle of the movie the story starts setting up a big fight to come at the casino. The casino looks like they rented some cheap office space and rolled in a green felt topped table. Perhaps they blew most of the budget on cigars? Until the final fight no weapons or improvised props were used, it was all hand to hand. There was nothing special to be seen, it was all basic punch, block, side step, kick. The power and focus was mostly there but it quickly became the same thing over and over again.
I think the current rating here is way high and I consider it just average for the year and genre.