In the prosperous and secretive city of Shanghai, a spy war concerning the fate of the country is quietly staged. Lin Yuan, a young agent with a complex identity, is not only an elite of the military, but also inextricably linked to the underground party. During an operation deep behind enemy lines, he accidentally rescued an underground party member and embarked on a path full of danger and betrayal. Wandering between dual identities, he must not only complete the task of military control, but also provide key intelligence to the underground party. When he discovered the shocking secret of collusion between senior military officials and the Japanese, Lin Yuan fell into an unprecedented crisis. With wisdom and courage, he skillfully collected evidence and worked closely with the underground party, finally exposing the conspiracy and defeating the enemy's plan. However, the war did not end, and Lin Yuan chose to continue to lurk, guarding the tranquility and peace of this land in his own way.
