No trace left by the knife

Sand Dune Island is a small island located at the easternmost part of Hong Kong. The island is covered with sand and rocks and is uninhabited. It has been bought by a wealthy Hong Kong man who plans to develop it into a resort. However, because Master Lai Yankang needs to hold a martial arts competition, he uses this island as a competition venue.
At this time, many luxury yachts were anchored on the sea around Dune Island, all of which were upper-class celebrities who were ready to watch the...