In which episode did he die at the wellhead?

He died in Episode 30 of The Arrow on the String.

Episode 30 tells the story of Jingguchi, who knew that this trip was dangerous and wrote a letter to his family, regretting that he had not fulfilled his filial piety. Jiang Yan came to the wellhead room during inspection, and the two quarreled. Jingguchi cried because he missed his family and scolded Jiang Yan for being sarcastic to him. Jiang Yan said that he hated following the Japanese in burning, killing and looting. The Japanese were not a superior nation and he believed that Xu Yihang would not let Jingguchi come back alive.

First flight discussed the plan with Zhang He and wanted to take the second flight with him, but the condition of the second flight was worrying. Seeing her sister Yihang cried again, she said that her sister was selfish and that she could bear the death of her relatives, but she collapsed when she was hurt. Erhang said that he only lived when he killed people.

Jingkou insisted on going, so Rong Shi set off with Jingkou. Zhumu led people to ambush ten miles outside Baiyun Cave. On the way, Jingguchi lamented that he had always wanted to challenge Rong Shi, but unfortunately he never had the chance. Rong Shi said he would give him a chance. Outside Baiyun Cave, Rong Shi indeed gave Jingguchi a chance and admitted that he was cooperating with the volunteers.

Rongshi injured Jingguchi's right hand. Just when Rongshu was about to kill Jingguchi, Jingguchi drank the bullet and committed suicide. Yihang had already laid an ambush for the Japanese troops around Baiyun Cave, waiting for Zhumu to trap him. While Yihang was discussing with Rong Shi, the dead Jingkou suddenly came to life again, grabbed the car and escaped. The first and second flights took a shortcut and chased through the mountains and forests.

Iguchi finally escaped back to Zhumu's army, but his mouth was pierced by himself and he could not speak. He asked for paper and pen, and just wrote the word "Rong Shi" with his left hand. The first and second aircrafts that caught up were shot and killed.

Extended information:

"The Arrow is on the String" tells the story of how after the September 18th Incident, the Japanese invaders deployed a plan to fully attack Jehol. On the day of Xu Yihang's wedding, Rong Shi saw through the Japanese aggressors' plot to take advantage of the Xu family's wedding to massacre the Xu family. Unexpectedly, his message was intercepted by a traitor in the Xu family, and the Japanese aggressors succeeded. The Xu family was wiped out, and only Xu Yihang and his sister Xu Erhang relied on their ancestral magic arrows to break out of the siege. The second brother Xu Jinchuan hurriedly returned to China.

The three siblings started from avenging the family to fighting for the nation. Xu Yihang's reckless and persistent pursuit of revenge put her in trouble many times. Fortunately, she was always able to get help from Rong Shi, the eldest son of the Rong family who dominated Chengde, both openly and secretly. Rong Shi helped Yihang many times, and the two gradually got to know each other. When the two finally let go of everything and confessed, Yihang's fiancé Zhao Hua came back from the dead.

During an operation, the Xu brothers and sisters were ambushed. Xu Jinchuan and Xu Yihang were arrested. Fortunately, they were rescued by undercover Communist Party members. The three siblings joined the Anti-Japanese Allied Forces and used magic arrows to fight against the Japanese army. , completed tasks that others could not complete again and again. The Nationalist Government passively resisted Japan and sent the Central Army to encircle and suppress the Anti-Japanese Allied Forces. The Anti-Japanese Allied Forces were forced to disband.

The three siblings briefly lost the direction of their struggle, but soon after, they returned to Chengde and continued to deal with the Japanese invaders in their own way, performing a series of love and hate emotions. A story about hatred between country and family.