The content of the letter the Second Prince wrote to Yan Bingyun was about the Qing court situation and Fan Xian's return to court. The letter mentioned that Fan Xian's return to court would cause unrest in the Qing Kingdom and make it easy for Northern Qi to use him. The Second Prince told Yan Bingyun the ins and outs of the matter and expressed that Fan Xian would fight to the death with him after he returned. Yan Bingyun was worried about Fan Xian's return. He believed that this would trigger a great battle and make the Qing court unstable. However, what he did not know was that if Fan Xian died in Qing Kingdom, no one in the Qing capital would survive. Thus, if Yan Bingyun had known this earlier, he might not have attacked Fan Xian. As for the specific content of the letter, the search results did not provide detailed information, so it was impossible to give a more specific answer.

The content of the letter the Second Prince wrote to Yan Bingyun and Fan Xian was about the state of the Qing Kingdom and the unrest that Fan Xian's return to court might cause. The letter mentioned that Fan Xian's return to court would cause unrest in the Qing Kingdom and make it easy for Northern Qi to use him. The Second Prince told Yan Bingyun the ins and outs of the matter and expressed that Fan Xian would fight to the death with him after he returned. Yan Bingyun was worried about Fan Xian's return. The contents of the letter were not mentioned, so he could not give a detailed answer.
The content of the letter the Second Prince wrote to Yan Bingyun was about the state of Qing court and the unrest that Fan Xian's return to court might cause. The letter mentioned that Fan Xian's return to court would cause unrest in the Qing Kingdom and make it easy for Northern Qi to use him. The Second Prince told Yan Bingyun the ins and outs of the matter and expressed that Fan Xian would fight to the death with him after he returned. The contents of the letter were not mentioned, so he could not give a more specific answer.
The Second Prince's letter to Yan Bingyun was about the state of Qing court and the unrest that Fan Xian's return to court might cause. The letter mentioned that Fan Xian's return to court would cause unrest in the Qing Kingdom and make it easy for Northern Qi to use him. The Second Prince told Yan Bingyun the ins and outs of the matter and expressed that Fan Xian would fight to the death with him after he returned. The contents of the letter were not mentioned, so he could not give a more specific answer.
According to references 2 and 3, the Second Prince's letter to Yan Bingyun might have written the following: - Yan Bingyun was Xiao En's grandson. - Chen Pingping's plan for Xiao En's grandson; - The Second Prince learned of Chen Pingping's plan through Zhu Ge. It should be noted that this was only a speculation based on the reference materials. The specific content of the letter could only be known by watching the TV series or reading the original work.
Yan Bingyun's letter had written," Fan Xian's return to court will cause chaos in the Qing Kingdom."
In Joy of Life, the Second Prince's letter to Yan Bingyun was about the Qing court and Fan Xian's return to court. The letter mentioned that Fan Xian's return to court would cause unrest in the Qing Kingdom and make it easy for Northern Qi to use him. The Second Prince told Yan Bingyun the ins and outs of the matter and expressed that Fan Xian would fight to the death with him after he returned. The contents of the letter were not mentioned, so he could not give a detailed answer.
[Yes, Yan Bingyun is the Second Prince's man.] In Joy of Life, Yan Bingyun was the head of a secret intelligence agency that the Overwatch Council had placed in Northern Qi. He was a spy responsible for gathering military intelligence. In the plot, Yan Bingyun's mission to Northern Qi as a spy failed and he was eventually betrayed. The person who betrayed him was the Second Prince's subordinate. In addition, some search results mentioned that the Second Prince and the Eldest Princess were in cahoots. They supported and used Yan Bingyun together. Therefore, based on the information provided, it could be confirmed that Yan Bingyun was the Second Prince's man.
Yan Bingyun was not the Second Prince's man. He had chosen the Second Prince to protect Fan Xian. Furthermore, his choice had been discussed. His goal was to deal with the Second Prince. Therefore, Yan Bingyun was not the Second Prince's man.
The relationship between Yan Bingyun and the Second Prince was complicated and tense in Joy of Life. The Second Prince had once sent Xie Bian to threaten Fan Xian, asking him to rely on him. He had also threatened Yan Bingyun. If Fan Xian did not agree, Yan Bingyun would join forces with Xie Bian to deal with Fan Xian. However, Fan Xian did not compromise. Instead, he colluded with Yan Bingyun. The content of the letter the Second Prince wrote to Yan Bingyun was about the Qing court situation and Fan Xian's return to court. The letter mentioned that Fan Xian's return to court would cause unrest in the Qing Kingdom and make it easy for Northern Qi to use him. Yan Bingyun was worried about Fan Xian's return. Yan Bingyun's sword stabbed into Fan Xian's body, but Fan Xian was not truly dead. The Second Prince expressed his appreciation for Fan Xian's " death " and promised to do what Yan Bingyun had requested. However, there was no clear answer as to whether Yan Bingyun had really sided with the Second Prince.
The relationship between Yan Bingyun and the Second Prince was complicated and tense in Joy of Life. The Second Prince had once sent Xie Bian to threaten Fan Xian, asking him to rely on him. He had also threatened Yan Bingyun. If Fan Xian did not agree, Yan Bingyun would join forces with Xie Bian to deal with Fan Xian. However, Fan Xian did not compromise. Instead, he colluded with Yan Bingyun. In the second season, the grudge between Fan Xian and the Second Prince had just begun. The Second Prince had given Fan Xian three " gifts," including candied haws, the title deed to the bookstore, and Fei Jie's rubber gloves. This was seen as the Second Prince's provocation to Fan Xian, indicating that Fan Xian would become enemies with the Second Prince. However, there was no specific information about the Second Prince and Yan Bingyun's ending or the development between them.