All of these eunuchs learned martial arts, with their leader at the superior master level.
It is quite often considered that the Moorim and eunuchs were unrelated. Some were even under the impression that the eunuchs don’t learn martial arts. However, as the Imperial family underwent a change in power, they appeared to be a group of guards trained in martial arts.
In the Daemyeong Empire, there were said to be four groups of well-trained martial arts users: Alumni, Seochang, Internal Haengchang, and the Imperial Guards, or the Emperor’s guards. These were the official names given to distinguish one organization from another, but they are entirely under the eunuchs.