Fei Jie knew the Shadow because of his brother Sigu Jian. Fei Jie had treated Sigu Jian in the past, so he was very familiar with the people around Sigu Jian. The Shadow's true identity was Sigu Jian's younger brother. He was Chen Pingping's personal guard and always wore a black mask. Fei Jie wasn't surprised when he took off the shadow's mask.

The reason Fei Jie was able to knock out the shadow was probably because Fei Jie was an expert in using poison. He might have used a special poison to knock out the shadow. Although martial artists above Rank-9 were immune to most poisons, it did not rule out the existence of some special poisons that could bypass this immune system.
The shadow that Fei Jie saw in the TV series " Celebrating Years " was played by the actor Liu Hua.
The shadow Fei Jie saw was Great Grandmaster Sigu Jian's younger brother.
The shadow Fei Jie saw was the younger brother of Dongyi's Great Grandmaster Sigu Jian.
The shadow Fei Jie saw was Sigu Jian's younger brother. The specific identity of the Shadow was not directly pointed out, but Fei Jie was very surprised when he took off his mask, so he could confirm that the Shadow was Sigu Jian's younger brother. However, the search results did not provide any pictures of Fei Jie seeing the shadow. Therefore, there was no way to provide a picture of Fei Jie seeing the shadow.
The shadow Fei Jie saw was Sigu Jian's younger brother.
The shadow Fei Jie saw was Sigu Jian's younger brother. The Shadow was Chen Pingping's personal guard. He always wore a black mask and was cold and silent. Fei Jie was very surprised when he took off his mask, but he didn't directly reveal the identity of the shadow. Thus, according to the information provided, the shadow Fei Jie saw was Sigu Jian's younger brother.
The shadow Fei Jie saw was the younger brother of Dongyi's Great Grandmaster Sigu Jian.
The shadow Fei Jie saw was in the 40th episode of Joy of Life.
The shadow Fei Jie saw was the younger brother of Dongyi's Great Grandmaster Sigu Jian. After Fei Jie removed the Shadow's mask, he was surprised to discover that the Shadow's true identity was Sigu Jian's younger brother. The Shadow was Chen Pingping's personal guard. He always wore a black mask and was cold and silent. Fei Jie had previously treated Sigu Jian's illness, so he knew his younger brother, the Shadow. According to the information provided, the shadow Fei Jie saw was Sigu Jian's younger brother.
The shadow Fei Jie saw was the younger brother of Dongyi's Great Grandmaster Sigu Jian.