Lian Ming, a criminal police officer from Lingdong, goes undercover at Heidao Prison to solve a case involving missing people along the border. Meanwhile, Wen Bang, a retired special forces soldier from Nanling, is forced to serve time in the same prison in order to rescue Yachun and her daughter—the only family he has left. Inside, the two men evolve from adversaries into allies.
(Source: Chinese = iQIYI || Translation = MyDramaList)