Zhao Changhe didn't know how Ying Wu had found the space or what he considered "obtaining" it. Surely, it wasn't simply posting guards there...
And even if he had "obtained" it, how could he link them together? It wasn't like assembling blocks.
Perhaps he had his own unique method, which naturally was inconvenient to inquire about, as others might not be willing to divulge such information.
From the perspective of this cooperation alone, there seemed to be no problem, so Zhao Changhe said, "By cooperation, do you mean we share information about secret realms? I tell you what I know, and I can freely access your intelligence in return?"
"As long as it's related to secret realms, it can all be shared with Young Master Zhao. Even secret realms that we have discovered in the past are open for you to explore if you're interested."
Zhao Changhe expressed his approval, "Lord Ying is straightforward."