Black Island PrisonEpisod 04

To solve a border missing persons case, Lian Ming, a detective from Lingdong, also infiltrates Black Island Prison undercover. Wen Bang, a former special forces operative from Nanling, is compelled to enter the prison and serve his sentence in order to rescue Yachun and her daughter, who depend on him as much as he depends on them. Behind bars, the two move from mutual hostility to mutual support. As they join forces against the gangs, they must also outwit the mounting crises their true identities create. Even as they slowly expose the prison's criminal truth, a far greater threat is closing in...