In the Eastern Province, many factions have attempted to find Kill Society. Some sent people to join Kill Society, hoping to slowly infiltrate the higher ranks, but they all failed.
Although the assassins of Kill Society are divided by rank, even the top elite assassins don't know where Kill Society is located. Apart from the high price of their killings and taking on any task, they are no different from ordinary assassins.
Others tried to locate Kill Society through the persons collecting the payments. After all, Kill Society charges for killings; one has to collect the money somehow.
As it turned out, people discovered Kill Society collects payment directly using treasures. They send a beam of light to retrieve the valuables from a distance.