We can conclude that 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 contents of the letter were not mentioned, so he could not give a detailed answer.

In the letter the Qing Kingdom's Second Young Master had written to Yan Bingyun, the specific content was not mentioned in the search results provided, so it was impossible to give a detailed answer.
After Yan Bingyun returned to the Qing Kingdom, he became the Director of the Qing Overwatch Council and became the new King of Darkness. After Fan Xian returned to Jingdou, he had followed Fan Xian and helped him plan. In addition, the relationship between Yan Bingyun and Shen Wan 'er was also the most heart-wrenching existence in the drama. The specific follow-up plot was best understood by reading the original novel.
There was no clear information about the specific follow-up plot after Yan Bingyun returned to the Qing Kingdom. However, Yan Bingyun became the head of the Fourth Bureau of the Qing Overwatch Council, protecting the Qing Kingdom. He had helped Fan Xian come up with many ideas. After Fan Xian returned to Jingdou, he had become his little brother and had always followed Fan Xian. Yan Bingyun's position was difficult. On one hand, he was loyal to the Qing Kingdom and the Qing Emperor. On the other hand, he saw Fan Xian as a friend. He also had a relationship with the sister of Northern Qi who had instigated Shen Zhong, but the details of the subsequent plot and Yan Bingyun's ending did not provide clear information.
After Yan Bingyun returned to the Qing Kingdom, he became the head of the Fourth Bureau of the Qing Overwatch Council and took over his father's position. He took on the role of Director of the Overwatch Council in Qing Kingdom and became the new King of Darkness. Yan Bingyun had followed Fan Xian after he returned to Jingdou and helped him plan. His position was difficult. On one hand, he was loyal to the Qing Kingdom and the Qing Emperor. On the other hand, he saw Fan Xian as a friend. In addition, there was a heart-wrenching relationship between him and Shen Wan 'er. However, the specific follow-up plot and Yan Bingyun's ending did not provide clear information. Therefore, regarding the specific story of Yan Bingyun's return to Qing Kingdom, one needed to read the original novel Joy of Life to understand.
Yan Bingyun's relationship with the Qing Kingdom was loyal and close. He was a member of the Qing Kingdom and existed for the benefit of the Qing Kingdom. Even though the details of their interactions and exchanges were not clear, Yan Bingyun's promotion to the position of Director of the Overwatch Council showed the Qing Emperor's high regard and importance for him. He used his wisdom and ability to make friends with many high officials and nobles in Northern Qi, which made it convenient for Qing Kingdom's intelligence work. Yan Bingyun was loyal to the Qing Kingdom and the Qing Emperor. At the same time, he respected Chen Pingping. Even though he could not be with Shen Wan 'er, he had always protected the Qing Kingdom and became its right-hand man.
Yan Bingyun's relationship with the Qing Kingdom was loyal and close. He was a member of the Qing Kingdom and existed for the benefit of the Qing Kingdom. Even though he could not be with Shen Wan 'er, he had always protected the Qing Kingdom and became the Director of the Overwatch Council. He was loyal to the Qing Kingdom and the Qing Emperor. At the same time, he respected Chen Pingping. Yan Bingyun used his wisdom and ability to help Fan Xian and became his right-hand man and friend. His ending showed his loyalty and devotion to Qing Kingdom.
Yes, Yan Bingyun returned to Qing Kingdom. In Joy of Life, Fan Xian sent Shen Wan 'er to the Yan manor and Yan Bingyun returned to Qing Kingdom.
Yan Bingyun was a character in the TV series " Joy of Life ", played by actor Xiao Zhan. He was the head of the Overwatch Council stationed in Northern Qi and the eldest son of Yan Ruohai, the head of the Fourth Bureau. Yan Bingyun was a spy, responsible for gathering military intelligence and contacting dignitaries. After he had been captured in Northern Qi, he had been tortured, but he had never leaked the Qing Kingdom's intelligence network. There was a story between Yan Bingyun and Shen Wan 'er. The relationship between them was the result of General Shen Zhong's perfunctory attitude, and the two of them set up a marriage agreement. The search results didn't provide any clear information about Yan Bingyun's ending.
Yan Bingyun was a character in the TV series " Celebrating Years ", played by actor Xiao Zhan. He was the head of the Overwatch Council stationed in Northern Qi and the eldest son of Yan Ruohai, the head of the Fourth Bureau. Yan Bingyun was a spy, responsible for gathering military intelligence and contacting dignitaries. After he had been captured in Northern Qi, he had been tortured, but he had never leaked the Qing Kingdom's intelligence network. There was a story between Yan Bingyun and Shen Wan 'er. The relationship between them was the result of General Shen Zhong's perfunctory attitude, and the two of them set up a marriage agreement. The search results didn't provide any clear information about Yan Bingyun's ending.
" The Young Master of the Yan Residence, Yan Bingyun " was a character in Maoni's web novel, Joy of Life, and its derivative works. He was the son of Yan Ruohai, the head of the Fourth Bureau of the Qing Inspection Council. On the surface, he was a cynical young master of a noble family, but in reality, he was a double-sided spy with firm beliefs. Yan Bingyun had been captured by Northern Qi during his diplomatic mission to Northern Qi. Northern Qi had used his identity to plant a large number of spies in the Qing Kingdom. He had endured humiliation to complete his mission and finally succeeded in catching all of these spies. After returning to the Qing Kingdom, he was suspected by the Qing Emperor because of his high achievements and was eventually demoted to a commoner. In the TV series Joy of Life, Yan Bingyun was played by Xiao Zhan.