In 1942, the occupied area of Jiangnan in China. The one-line contact "Candle" of Ordnance Industry Department technician Shen Kunyu was captured by the Japanese Gendarmerie on the eve of the meeting and committed suicide on the spot. Shen Kunyu has become a kite with broken strings - no one can prove his identity, the superior agency has withdrawn, and the traitor is using his intelligence to exchange for a way out. He must survive 72 hours. Using his experience in the arsenal, he transformed a grenade into a trip mine, blowing up the tracking puppet army team; using toothpaste peel and sulfuric acid to make a delayed combustion device, he burned the archives truck of the Aoki Agency. But what really saved him was the ability called "morale aura" - when he silently recited the names of his comrades, the fear of those around him would turn into calmness. The price is that each time it is used, his perception of pain and empathy decreases by 1%. After using it for the second time, his hands no longer shook when he strangled the traitor with his own hands. For the fifth time, he watched his partner Jiang Jibei get shot, and all he could think about was tactical calculations. For the tenth time, Allied Liaison Officer Erin Winters asked him: "Do you still remember why you fought?" Shen Kunyu found that he needed to think for three seconds before answering. At the same time, Yamamoto Hayato, the director of Japan's Special High School, focused on this "emotionless ghost." In the interrogation room, Shen Kunyu used a terrifyingly calm psychological game to make Yamamoto doubt his own judgment - but the side effects of the halo were pushing him into the abyss. When Yu Wanqing, the only trusted person on the other side of the single line, is thrown into the light, he must use his remaining humanity to complete the last game of chess before he becomes completely numb.
