该剧讲述了五年前“西北狼”犯罪集团遭警方剿灭，但首领古木岚、骨干老枪和警方派出的卧底林柯等人全部失踪，生死难测。五年后“西北狼”集团死灰复燃重现江湖，警察楚一寒为了寻找母亲林轲，主动请缨成为卧底再度潜入犯罪集团，在前刑侦副支队长、当年西北狼案的主要执行人程樊的支援下一步步深入犯罪集团的核心。在这个过程中，楚一寒与古蔺娜产生交集并互生好感，两人一同经历了一系列阴谋，并在险象环生的种种情境之下终于拨开重重迷雾……
Five years ago, the "Northwest Wolves" crime syndicate was annihilated by the police, but the leader of the group, Gumulan, the backbone of the old gun and the undercover agents sent by the police, such as Lin Ke, all disappeared, and it is hard to know whether they are alive or dead. Five years later, the "Northwest Wolf" group resurfaced, police Chu Yihan in order to find his mother Lin Ke, took the initiative to become an undercover once again infiltrated into the crime syndicate, in the former deputy chief of the Criminal Investigation Department, the year of the Northwest Wolf case of the main executor of the support of Cheng Fan step by step in-depth the core of the crime syndicate. In the process, Chu Yihan and Gulinna intersection and mutual affection, the two experienced a series of intrigue together, and in a dangerous situation under a variety of circumstances finally opened the fog...
O detetive de polícia Chu Yi Han se disfarça para se infiltrar em uma organização criminosa na esperança de encontrar sua mãe. Por acaso, ele encontra Gu Lin Na.
