Fifteen years after the end of the world, the ground has been completely occupied by ferocious mutant beasts, and mankind's only remaining hope lies in the floating city suspended in the air. During a routine maintenance, maintenance engineer Lin Xia accidentally touched the core of the defensive energy shield that had been dusty for a long time. He successfully activated it and became the only "shield master" of the floating city. At the same time, the mutated beast leader "Split the Earth" led his tribe to launch an unprecedented siege on the floating city. With the trust and assistance of the guard captain Gu Yan, Lin Xia must quickly master the energy shield control skills, fight side by side with Gu Yan, and lead the residents of the floating city to strengthen the defense line, repair weapons, and reserve supplies. In this desperate battle of defense, Lin Xia must defend the last piece of pure land for mankind.
