I Called You Brother, You Call Me a Mole?

This is a series centered on an undercover agent, a criminal organization, and the forces of justice. The story follows undercover agent Chen Chuliu as he infiltrates the crime syndicate led by Zhang Tianming to search for his missing sister, Xiyue. In the process, Chen Chuliu must not only face the suspicion and tests of the criminals but also navigate the complex emotions between his comrades and family.