Busan City, the location of the Myriad Worlds teleportation arrays, was a circular structure formed by nine grand halls connected in a circle.
Because of this, the circular structure had nine entrances and exits, which also served as the gates to the nine grand halls.
"These nine grand halls are where the Myriad Worlds teleportation arrays of Busan City are located... Inside each of these nine grand halls, there are nine Myriad Worlds teleportation arrays, corresponding to nine different Myriad Worlds."
Chapter 3077