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A passenger on the plane suddenly went berserk and encountered strong turbulence. When everything calmed down, the passenger had died of acute cerebral edema. However, the passenger's identity was not ordinary. He was a senior researcher at a certain nanny unit and had been under surveillance by relevant authorities for allegedly selling state intelligence to foreign espionage organizations. His mysterious death caused the surveillance and pursuit to come to a halt. At this time, the State Security Bureau arrested the deceased's brother, Wang Hao. They then devised a plan: have the investigator Shen Kang (played by Sun Honglei) impersonate Wang Hao to lure the spies out. This undercover pursuit was connected to the flight attendant Li Xiaowan (played by Fu Jing) through Wang Hao. As they interacted, they began to develop feelings for each other. However, Shen Kang's undercover identity could not be exposed, and Xiaowan was troubled by Wang Hao's involvement in the underworld. As the investigation deepened, they faced even greater challenges...