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Fifteen years ago, Ye Kai, who depended on his younger sister, lost her in Shanghai. As an adult, Ye Kai joined the Dark Wolf intelligence agency and became its only 5S-level agent. One day, Ye Kai receives a mission from Wolf Head: Su Qingyao of the Su Group has developed a stealth coating for drones, which the Shanghai underworld boss Zhao and his second uncle Su Yunhe covet. Wolf Head orders Ye Kai to go to Shanghai to protect Su Qingyao, safeguard the coating formula, and search for the sister he lost fifteen years ago.