Watch Online Free on Watchseries. As a marine biologist, Guan Zixuan, during a research on Brachycephalus salamander, Brachycephalus mutated and escaped. Before that, Guan Zixuan's father also disappeared because of researching the giant salamander. In order to find this mutant giant salamander and find his father, Guan Zixuan decided to set off to the deep sea and go to the deserted island.