When they parted at the Awakening Spring Tower, Jiang Beiran had kept the contact information and addresses of all the Ninth-Grade Grandmasters.
Of course, he originally only wanted the contact details of the Ninth-Grade Grandmasters who wished to join the Mysterious Star Tower, but in the end, all of them expressed their desire to join, so he ended up collecting everyone's. It could be said that the contact list in Jiang Beiran's hands was something the lords of the six great nations would drool over but could never obtain.
This was because these Ninth-Grade Grandmasters were fond of wandering or entering seclusion at a moment's notice, making it incredibly difficult to find them. However, what Jiang Beiran got wasn't their contact information at their respective Mysterious Guilds.
To put it simply, what the lords of the six nations had were their "office" numbers, while Jiang Beiran had their personal numbers. The efficiency of finding them was naturally on a completely different level.