Joy of Life Sean revealed his secret in episode 41.

Sean revealed his secret in the 41st episode of Joy of Life.
Xiao En's secret was that he met Ye Qingmei in the temple and obtained the martial arts manual and pills. He told this secret to Fan Xian, but Ye Qingmei asked him to keep it a secret because revealing the location of the Temple would bring about a great disaster. In order to protect Ye Qingmei's beliefs, Xiao En chose to keep his mouth shut.
Joy of Life Sean's secret was about the temple. Thirty years ago, Xiao En and Ku He had gone to the temple and met the little fairy, Ye Qingmei. They had obtained martial arts manuals and pills. This secret was the most important part of Joy of Life, and it was also Fan Xian's motivation to find the Temple. Xiao En and Ye Qingmei were siblings in the movie, and they had a deep relationship. Ye Qingmei had increased the Qing Kingdom's overall national strength through the establishment of the palace treasury and the prosecutor's office and helped the Qing Emperor. Xiao En had kept this secret until he was about to die.
Sean's secret was about the temple. Xiao En knew the location of the temple and had seen Ye Qingmei come out of the temple. He told Fan Xian this secret, but at Ye Qingmei's request, he could not reveal this secret. Revealing the location of the Temple might bring a great disaster to the world. Therefore, Sean's secret was related to the temple.
Xiao En's secret during the celebration was about the location of the temple and Ye Qingmei's existence. Xiao En knew the location of the temple and had seen Ye Qingmei walk out of the temple. He told Fan Xian this secret, but at Ye Qingmei's request, he could not reveal this secret. Revealing the location of the Temple might bring a great disaster to the world. Xiao En had kept this secret all this time and only told Fan Xian before he died. Although the specific use of the secret was not mentioned, it could be speculated that Xiao En's secret might be related to the power of the Temple, Ye Qingmei's identity, and related martial arts manuals. The specific use needed to be understood by watching the "Celebrating Years" series.
Joy of Life Sean revealed his secret in episode 41.
Joy of Life Sean revealed his secret in episode 41.
Sean revealed his secret in the 41st episode of Joy of Life.
Sean revealed his secret in the 41st episode of Joy of Life.
Xiao En was a character in Joy of Life. He was a powerful official of Northern Qi and was in charge of secret intelligence. He had been captured and imprisoned by Chen Ping for 20 years. He was filled with hatred for Chen Ping and her accomplices. After Xiao En was seriously injured by Lang Tiao, he told Fan Xian the secrets of the Temple and Fan Xian's background. In the end, he died of blood loss. Xiao En's existence was a hindrance to both the Qing Kingdom and Northern Qi because he had contributed greatly to Northern Qi's intelligence. But to the Qing Kingdom, he was an obstacle to the Northern Expedition. Northern Qi also did not tolerate Xiao En's existence, because he could become a new power and threaten Northern Qi's rule. Xiao En and Fan Xian's mother, Ye Qingmei, had once explored the Temple together, but they had been captured by Ku He. Chen Pingping had arranged for Fan Xian to escort Xiao En back to Northern Qi and let him reveal his background and political schemes.