At the end of the Republic of China, Lin Zhiyuan was accidentally involved in the espionage network and became a new agent. He wandered between master and apprentice, comrades-in-arms and enemies, experiencing the choice of faith, the test of loyalty and the battle of life and death. He led many suspenseful spy battles, performed humorous legends with his partner Jin Liang, and worked with female agent Fang Rou to solve the mystery. They not only have to fight wits and courage under the shadow of the knife, but also experience growth among temptation, betrayal, and mission. In the final battle, Lin Zhiyuan faced the ultimate test of life and ideals, regained his original intention, used wisdom to smash the biggest conspiracy, and protected faith, friendship, and homeland.
