In 1986, during the Asian Games in Seoul, the whole country of South Korea was immersed in the lively atmosphere of sports competition. However, on the Elephant Island in the southwest of South Korea, a tragic and confusing serial murder case occurred. Elephant Island is located in the middle of the sea. There are only 17 residents on the island. People live and work in peace and contentment. The conscientious Dr. Yu Chengyou cares about everyone's health and is the most dependent outsider on the islanders. It happened to be the birthday of Grandpa Jin Zheying, who was 70 years old. The islanders gathered together to eat, sing and dance and play all night. But in the early morning of the next day, two electricians were brutally murdered, and the people on the island were panicked for a while. People talked about it and suspected each other. After that, the cruel murderer did not stop, but launched a new round of massacres. The island called Elephant has become the most terrifying and bloody hell on earth...