Lu Yan, who has been undercover for nine years, returns home, only to find out from his wife's Morse code that his home is under surveillance. It turns out that his wife was manipulated by Lu Yan's police school classmate Zhou Yuanhang, who used her to set up a trap and wanted Lu Yan to act as a messenger carrying the secrets of the Black Scorpion organization. Lu Yan calmly dealt with the situation, cooperated with the police to set up a counterattack, and finally destroyed the forces related to the Black Scorpion, brought Zhou Yuanhang to justice, and finally ushered in a stable and happy life with his wife.
