Lex was very confident in his ability to hide his thoughts and emotions, but the moment he realized Wu Kong's identity - which synchronized with Mary telling him her suspicions - the guest turned his attention towards Lex.
The bizarre thing was that under the gaze of the new guest, Lex felt nothing. He distinctly recalled how the system had hidden itself in front of Ballom, yet in front of Wu Kong it did not react at all. It was as if the system wasn't capable of detecting him at all - something he dared not confirm with a scan of the system, or an evaluation of the guest in front of him.
Mary had never warned him like this before, which made Lex think of one thing: that she had heard of Wu Kong from back when she was alive.
As if uninterested, Wu Kong turned back towards the auditor.
"Junior, you're no fun," Wu Kong said with exasperation, causing the auditor to bow down even more.
