1, the odds 1 episode: Kong Fang shows the magic of arithmetic, and Kong Yuan captures Japanese spies. 1942 War of Resistance against Japanese Aggression is in full swing. Kong Fang, a professor in the Department of Mathematics of Chongqing Central University, is young and knowledgeable, and can be called a mathematical genius. Early in the morning, he heard an unremarkable war news on the radio. The news said that the Eighth Route Army bravely retreated from the enemy with the latest weapons. Although the final defeat made Cishui County fall, it destroyed hundreds of enemies. This seemingly unremarkable good news made Kong Fang, who is good at calculation and analysis, discover several hidden information: First, his hometown Cishui County fell, but he believed that his father Kong Liangfeng and his sister Kong Rong would be safe and sound, because his father had been in business for many years and the businessman's shrewdness would enable him to properly handle the relationship with the Japanese army; Secondly, the place where new weapons are used must be not far from the arsenal where new weapons are developed, which exposes that there may be an eighth route army arsenal near cishui county. Third, his eighth route army brother Kong Yuan is probably in this secret arsenal, because Kong Yuan hasn't written to him for more than one hundred days, which shows that he is engaged in a secret job, which may be related to this arsenal. Hearing Kong Fang's analysis, Hai Yin, the psychological teacher of his fiancee, was dumbfounded. She felt that these analyses had been shelved. At this time, Kong Fang said worriedly that his analysis would never escape the eyes of Japanese military experts, and Yoko Hong must have thought of this. Sure enough, as Kong Fang expected, Yokoo Hiroshi, a senior Japanese commander who had taught Kong Fang in Japan, also keenly analyzed the existence and general location of the arsenal. Yokoo Hiroshi, who has always liked and mastered China culture, soon extended his tentacles to Cishui County near the Arsenal. At this time, Cishui County was in chaos, many people fled and took refuge, and Kong Fang's father's grain store closed down. The Japanese army still found Kong Liangfeng and Kong Rong in hiding, and the Japanese second lieutenant caught Kong Rong and forced Kong Liangfeng to hand over the food. Kong Liangfeng was distressed that his daughter had to promise to raise food.

2, the odds of winning the second episode: the spy who attacked the weapons factory was arrested. According to the information provided by Ishida, Yan and Dazui and others ambushed at the meeting place agreed by the Japanese Surveying and Mapping Group that night. Mouth came forward to lure the enemy, and two Japanese surveyors who came to meet him were killed, but the cunning Japanese army killed Mouth before he died. Big mouth sacrificed heroically. The sacrifice of big mouth made Kong Yuan and the political commissar of the Eighth Route Army in charge of the Arsenal feel very sad. Director Tan once again suggested that they report the situation here to the higher regimental headquarters. He is worried that the Japanese army will have follow-up actions. Kong Yuan insisted on not reporting. He thought that the regimental headquarters was now fighting the Japanese army at the front line of Taihang Mountain, and even if they came to report, they would be beaten at a loss. However, Kong Yuan was also worried that the Japanese surveying and mapping team would not return to the team, and became suspicious. He ordered the secret service company to strengthen its fortifications. Sure enough, the surveying and mapping team did not return to the team on time, which made Yokoo Hiroshi realize that the surveying and mapping team was in danger, and at the same time made him conclude that the Eighth Route Army Arsenal was indeed in Hutou Mountain. Soon, the Japanese army sent a special team to Hutou Mountain to investigate. They met a gun battle of the Eighth Route Army patrolling in the forest, and both sides suffered casualties. Kong Yuan got the news soon, and he quickly arranged for the squad to ambush and prepare for the battle. Soon the team came to the top of Hutou Mountain. They looked down from the top of the mountain and found the armory, but everyone in the armory was in ambush. Just when the Japanese army was surprised that the arsenal was empty, a Japanese soldier found himself stepping on a mine. The team suddenly realized that they had been ambushed.

3, the odds of winning the third episode: Kong Fang found Ishida, the regimental headquarters of the Eighth Route Army, and advised Kong Lianchang to eat. Three Japanese troops followed Luda in the mountains. Luda hid in the mountains and saw a hornet's nest. Ruda had a plan. He wrapped a hornet's nest in his clothes and threw it at three Japanese troops. Suddenly, three Japanese soldiers were stung and cried. Ruda won without a fight. He happily took the sniper rifles of three Japanese soldiers who had no resistance and left. Kong Fang and Hai Yin packed their bags and discussed how to rescue Kong Yuan as soon as possible. Kong Fang suggested taking a postal plane. As for how to persuade the other party to let them take it away, he smiled and asked Hai Yin to find a way. Soon they boarded the plane and flew to the headquarters of Taihang Mountain Independence Group. Knowing that the Japanese army chasing Luda had missed, Hiroshi Yokotani ordered Mount Fuji to immediately organize an encirclement and suppression team to arrest Luda. Mount Fuji didn't understand, and proposed to deal with a man as he deals with you, killing an arsenal every day until he forced Luda out. Hiroshi Yokoo immediately denied it. He told Fujiyama that the reason why the people in the arsenal were rescued was to provide experimental bodies, because they were going to study gas bombs here soon and needed a large number of living people to do experiments. Hiroshi Yokoo ordered these things and immediately went to the cell where Kong Yuan was held.

4, the odds of winning the fourth episode story: Kong Fang's relatives are looking for Xiao Yanwu's forest to encounter the Japanese army. Colonel Yang promised to do his best to investigate what they were asked to investigate. Kong Fang also proposed to go back to Cishui County. He wants to visit his father and find someone by the way. Yang taught Huang to send and return to Xishui. He said that there would be traffic police there to meet and protect them. Seeing that he could not refuse, Kong Fang agreed. Huang Jiang, Qiu, was sent to Xishui County and handed over to Meng Da and Meng Er, the traffic policemen who came to meet him. With the subtle observation and sensitivity of women, Hai Yin felt that Meng Da and Meng ertai were just like soldiers, and it was not safe for them to escort them. Kong Fang comforted her not to be too nervous. When the puppet troops guarding the city entered the gate of Cishui County, after routine investigation, they always felt that Meng Da and Meng Er were suspicious, so he secretly sent someone to follow them. After Kong Fang and Hai Yin arrived in Cishui County, they were temporarily separated from MengMeng, so he decided to take Hai Yin to find Xiao Gongdahe first. Kong Fang introduced Gong Dahe's identity to Haiyin before. Gong Dahe is the son of their parents' workers. When he was young, he always made friends with Kong Fang and Kong Yuan. This time, he wants Gong Dahe to help him fish in the river of Hutou Mountain. He explained that he had seen two Japanese soldiers jump off a cliff while defending Hutou Mountain in Japanese newspapers. They jumped off the cliff and threw two submachine guns into the river. Getting these two guns will play an important role in entering Hutou Mountain. Just as Kong Fang and Hai Yin were going to look for Gong Dahe by the river, Hai Yin suddenly found the puppet troops following them.