I Thought We Were Brothers, You Say I'm a Spy?

Undercover agent Chen Chuliu infiltrates the criminal group led by Zhang Tianming to find his missing sister, Chen Xiyue. During his undercover mission, he remains cautious, constantly dealing with the suspects' distrust and probing in a dangerous environment. At the same time, he must navigate the complex emotional entanglements between his companions and family, making difficult choices between justice and personal feelings. He silently holds his ground, waiting for the right moment to expose the crimes and reunite with his family.