Because the area where Winston Town is located is nearly impossible to completely isolate and prevent Transcendents from entering.
Even if the Immortal Council, the Witch Group, and the descendants of the other seven Ancestors were to act together, they could only manage to stop most of them—there would always be some Transcendents with special abilities who could make their way in.
This is also due to the curse.
If nothing unexpected happens, the descendants of the thirteen ancestors would surely hire some closely related Transcendents to enter Winston Town.
And then there's the official personnel.
Which means, the Winston to come will be busier than Messer City was at first.
After all, when Transcendents gathered in Messer City, it was largely just to watch the excitement of the extraordinary war between the Mellon Family and Hastu Club.
But here, the essence is different.
The Transcendents are here for the "Divine Blood."