The handsome Song Zhiyuan (Jiang Dongyuan) is a spy from North Korea, who, led by the shadow of an old spy code 441, broke into an apartment in Seoul and assassinated the defectors and their families. During this period, they were hunted by South Korean security services, and Song Zhiyuan narrowly escaped after a fierce shootout, but he was abandoned by his superiors because he thought he had the intention to defect. On the other hand, the failure of the operation led to the dismissal of Lee in-kui (Song Kanghao), the leader of the South Korean side, who had to set up a detective agency to earn a living by collecting money to track down the escaped Vietnamese bride. Soon after, Kim Jong Il and Kim Dae-jung had a historic meeting, which eased the situation between the DPRK and the ROK. Six years later, Li Renkui ran into Song Zhiyuan in a Vietnamese factory. He wanted to seize Zhiyuan and the mysterious shadow to make a lot of money, and Zhiyuan also wanted to use Renkui to exonerate himself from defection. The two men had ulterior motives to live under the same roof, and with the deepening of their understanding, their thoughts gradually changed.
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