Wang Yuvin's dark countenance can still be felt even behind the long nose black venetian mask he was wearing in the masquerade party. He was itching to inform his sister about Zhang Chenric's bold move of approaching Europa while he was on the stage delivering his welcoming speech. However, he cannot do so for Wang Reiji was already doing her undercover mission with Hanzo and Rentao. Also, he cannot simply leave his post for every person's eyes in the banquet hall were now locked on like magnets at him.
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(This part here happened before the commencement of the masquerade ball. I hope you don't get confused.)
On their way to the hotel earlier,Wang Reiji ran down the details of the mission to Wang Yuvin, Rentao, and Hanzo.