In 1941, the foggy city of Chongqing was full of undercurrents. The ace agent Gan Pingle, codenamed "Postman", encountered a well-designed ambush while delivering the top-secret intelligence "Han Mei". The intelligence network was exposed, comrades died, and all the evidence pointed to him as the mole! In order to prove his innocence, and to find out the enemy codenamed "Shadow" lurking in the deepest place, the panicked Ace must start a secret battle of life and death in the lost city under the pursuit of his own people and the gunpoint of the enemy. When trust becomes a luxury product and lies become a passport, can he complete the ultimate counterattack against the "Shadow" in the deadly hunt?
