It was exactly because of this reason that the Mountainshade Black Market assassins could never reveal their identity no matter what.
If the assassins revealed their identities, this would be a big taboo and they would even be killed by the thunder penalty of the Nine-Nine Heavenly Tribulation Oath.
If someone impersonated the Mountainshade Black Market, he would not be forgiven too!
There was an explicit rule clearly stipulated in writing that whichever sect or person dared to impersonate a Mountainshade Black Market member, they would definitely be annihilated by the Mountainshade Black Market.
In order to protect this baseline, the Mountainshade Black Market had even come up with a rule that all Mountainshade Black Market members who had reached the Saint Stage must swear using the Nine-Nine Heavenly Tribulation Oath that they would go all out to annihilate whoever impersonated as their fellow members.