1938, Qingniu Town. Shen Xichen knelt in front of the puppet army artillery tower, his hands covered with engine oil. In front of him is a newly repaired machine gun with a crooked handle, and behind him are the corpses of three compatriots - the villagers who wanted to steal food last night were used as targets by Kameda Masao for gun practice. Shen Xichen lowered his head and wiped the trigger without moving the corner of his mouth. He is a mechanic and an underground party lurker. The art of transformation allows him to transform into anyone, but after wearing the mask for twelve hours, there will be a trace of decay on his face. Tonight, at Kameda's birthday party, he will pretend to be Hou Debiao, who has just surrendered to the enemy, and steal the defense blueprints of the gun tower. The mechanical parts are 70% certain. If it fails, the twenty liaison officers in the turret will be imprisoned, and none of them will survive. If it succeeds, the Japanese ammunition depot and the gun tower will be able to fly into the sky. When Shen Xichen put on Hou Debiao's face and walked into the banquet hall, he saw his father Shen Huaiyuan tied to a pillar - it was a bait for the guerrillas. Kameda held the wine glass and smiled: "Technician Shen, I heard that you are an excellent gun repairer. Tonight, will you repair your father's kneecap with your own hands?" Shen Xichen crushed the detonator ring in his pocket. Tonight, he wanted to let this gun tower be buried with Qingniu Town.
