Episode 6 recap: The vanguard platoon strives to catch up and assist in the progress of the project. Villagers are dissatisfied with the detention of Tian Jian by the exploration team.

When the soldiers of the vanguard platoon worked tirelessly to build the Chongqing-Chengdu Railway, the people of Yongquan Town were deeply moved. Led by Mayor Guo, they brought delicious food such as cured meat and eggs to comfort the soldiers. Luo Xiangqian was deeply inspired and encouraged the soldiers to work hard to complete the railway as soon as possible to repay the hospitality of the villagers.

While the vanguard platoon and the villagers were celebrating at their base, bandit Shan Xiao and his thirty or so men sneaked over, preparing to sabotage the vanguard platoon's construction site. A villager who was returning from collecting firewood happened to see Shan Xiao and his men from a distance. He hurried back to report to the troops. Luo Xiangqian made urgent arrangements and launched a counterattack as soon as Shan Xiao and his men arrived.

Shan Xiao abandoned several bodies and fled in panic. Due to unfamiliar terrain, both Wu Qiang and Luo Xiangqian advised against Zhang Biao's pursuit. This incident reminded Luo Xiangqian to immediately make arrangements to strengthen the security and patrols of the construction site.

Competitions were held at various construction sites of the Chongqing-Chengdu Railway. Luo Xiangqian encouraged everyone to be spirited and surpass the neighboring Eighth Platoon. The task assigned by the Eighth Platoon's leader, Zhou Fengzi, was for each person to complete 1.5 units per day. Luo Xiangqian assigned the soldiers of the vanguard platoon to complete 2 units per day. Sha Kai found it unbelievable upon hearing this.

Tian Jian, along with Ye Lan and others, continued the construction and exploration work. Despite his old age, Tian Jian personally took charge of everything and diligently collected various data. One day, Tian Jian brought the exploration team to a place called Qinggangpo and took Ye Lan to a high point. He earnestly advised her to always remember this place because Ye Lan's father had died here.

Tian Jian handed Ye Lan a yellowed notebook, which was a relic left by her father. They had come all this way following the footsteps of Ye Lan's father. Ye Lan became excited upon hearing this. She shouted loudly to her father, expressing her longing, and made up her mind to inherit her father's aspirations. She vowed to dedicate her youth to the Chongqing-Chengdu Railway and let her father's spirit rest in peace.

Seeing that there were successors after old friends, Tian Jian was also moved to tears. The soldiers were working vigorously at the construction site, and Mayor Guo came to deliver mung bean soup to everyone. Sha Kai drank two large bowls in a row, but Luo Xiangqian hurriedly stopped him and had the other soldiers come over to quench their thirst.

A mobile medical team from a higher-level organization arrived at the construction site of the vanguard platoon. Dr. Yu, who led the team, asked about Luo Xiangqian's leg injury, but Luo Xiangqian quickly changed the subject.

Zhang Biao had a large wound on his hand, and he hesitated before seeking treatment from Dr. Yu. When he saw that Dr. Yu was approachable, Zhang Biao involuntarily shifted the topic and started chatting with him. Suddenly, Sha Kai entered, and Zhang Biao, feeling embarrassed, quickly left.

Sha Kai claimed that he had an upset stomach from eating at the construction site and asked Dr. Yu to take a look. Meanwhile, Ma Bin and Zheng Yan, members of the exploration team, were suddenly surrounded by a group of villagers while surveying the terrain. The villagers accused them of disrespecting the ancestors of the Sun family, and Ma Bin and Zheng Yan realized that they had mistakenly entered a cemetery. The villagers blocking them were descendants of the Sun family.

Ma Bin and Zheng Yan quickly apologized and explained that it was unintentional, asking for forgiveness. However, the Sun family members persisted in their anger. One man, dressed in a Zhongshan suit, kept provoking and agitating the situation, further fueling the anger of the Sun family members. They captured Ma Bin and Zheng Yan, and Tian Jian, upon hearing the news, rushed over with Ye Lan. He repeatedly tried to persuade the other side to release the two, but the Sun family members, taking advantage of their larger numbers, refused to listen.

Helpless, Tian Jian had no choice but to offer himself in exchange for Ma Bin and Zheng Yan. Ye Lan went to seek help from the village chief. Considering that the Sun family held a significant position in the village, the village chief advised caution in dealing with the situation. He explained to Ye Lan and the others the reasons behind the Sun family's extreme emotions towards the railway construction. It turned out that the ancestors and fathers of the Sun family had worked on the railway before but ended up not receiving their wages and almost being imprisoned. As a result, they had to flee back home, and on the way, they accidentally fell into a deep ditch and lost their lives. Due to extreme poverty, they could only be buried in a simple grass mat without even a decent coffin.

Upon hearing this, Ye Lan seemed deep in thought. Zheng Yan and Ma Bin reported the incident involving the man in the Zhongshan suit to the village chief, who speculated that it might be Old Wu from the village. They decided to report the case to the police station.