Red Alert System in the City

Retired special soldier Lin Fan died because of the sacrifice of his comrades, so he was entrusted to take care of his sister Liu Ruyan before he died. When he learned that Liu Ruyan's company was targeted by foreign forces due to scientific research results, he almost died to protect Liu Ruyan, but as a blessing in disguise, he obtained the Red Alert System, and used the Red Alert technology and system in the city. . . .