Yan Bingyun's identity in Joy of Life was revealed by the eldest princess, Li Yunrui.

In Joy of Life, the person who revealed Yan Bingyun's identity was the eldest princess, Li Yunrui.
Yan Bingyun's identity was revealed by the Eldest Princess, Li Yunrui.
In Joy of Life, Yan Bingyun's identity was revealed by the Eldest Princess, Li Yunrui.
Yan Bingyun's identity was revealed by the Eldest Princess, Li Yunrui.
In Joy of Life, the person who revealed Yan Bingyun's identity was the eldest princess, Li Yunrui.
In Joy of Life, there was no explicit mention of who revealed Yan Bingyun's identity.
In Joy of Life, the person who revealed Yan Bingyun's identity was the eldest princess, Li Yunrui.
In Joy of Life, Yan Bingyun's true identity was a spy for the Qing Kingdom. He was sent to Northern Qi to become a spy. He was the son of Yan Ruohai, the head of the Fourth Bureau of the Overwatch Council. He was proficient in the four arts of zither, chess, calligraphy, and painting. His real identity was the grandson of Xiao En, the spy leader of Northern Qi. His mother was a prostitute.
In Joy of Life, Yan Bingyun's identity was the illegitimate son of Xiao En's son and a brothel woman. He was also Xiao En's grandson. He had been arranged by the Qing Emperor to be a spy in Northern Qi. In reality, he was the head of a secret intelligence agency that the Overwatch Council had placed in Northern Qi. His identity was revealed in the play as Sean's biological grandson, but he himself was not clear about his identity. Thus, Yan Bingyun's identity was both Xiao En's grandson and the head of Qing Kingdom's spies.
Yan Bingyun's real identity was the grandson of Xiao En, the spy leader of Northern Qi. His mother was a prostitute. He was not accepted by Sean and did not get a title. However, in Joy of Life, after he returned to Qing Kingdom, he gradually grew into the most capable assistant of the main character, Fan Xian.