The Invisible City that Su Yu discovered earlier seems to very much match the definition of lurking in the shadows.
The entire Transcendent Union had not previously discovered that city, indeed it was covert and hidden enough.
If Su Yu hadn't been able to fly and see the flaw from above, perhaps they would still be in the dark now.
Could it be that a certain seven-star strongman, after their city was destroyed, devoted themselves to researching advanced invisibility technology and then rebuilt the city?
However, that strongman didn't seem to consider the flaw from the sky.
Maybe he himself couldn't fly and couldn't see the flaw.
"Mr. Su Yu, are you going to investigate that Invisible City?"
"There might be the murderer of Illusion City hiding in that city, please take me with you when you go, Mr. Su Yu!"
Xie Yitian, hearing this, hurriedly said.
Su Yu, upon hearing this, glanced at him and noticed his determined expression, hiding a deep-seated hatred.