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Plot: In the early years of the Republic of China, the Institute of Biology of the Northwest Science Society received a mysterious letter, learning that there were mutant creatures infesting the sandy sea, so they sent an exploration team to the biology laboratory, but they were almost wiped out. Liu Mengxi (played by Xiao Bo) and Xia Xuan (played by Yu Xinyan) escaped as survivors with the samples, but they met the agency in Sand Dune Town