Tu Zheng learned in such a short time that Ye Zhen had cleared the way and appeared in Zhengyao City, guarded by the Great Zhou's military forces. Ye Zhen was somewhat suspicious, wondering if there was collusion with the Demon Race, exchanging favors.
But on second thought, within the Zhengyao Realm, the infiltration between Zhengyao City, guarded by the Great Zhou military, and the Two-World City, guarded by the Demon Race army, was in fact extremely severe.
Despite heavy scrutiny and every merchant household acting as guarantor, it's obvious that over the years, there must be spies from the Demon Race planted within Zhengyao City.
The Two-World City, guarded by the Demon Race, is the same.
Thus, Tu Zheng knowing about Ye Zhen appearing in Zhengyao City wasn't really surprising.
