Even though Caroline had promised Will Sr. that she would complete the mission, the real problem was that it was difficult for her to get an invitation to an underground auction with her current identity, let alone a few.
So she could only hope that someone would transfer the invitation, or take the invitation to bring her in. Obviously, the most suitable person at the moment was Edwin.
As the heir and core figure of the Anderson family, Caroline thought that he should not be in need of an invitation. "Looks like I'll have to trouble him."
At this moment, Caroline didn't know that to Edwin, he only needed to show his face to enter the underground auction. Hence, he didn't prepare an invitation for her.
Thus, when Caroline approached him and asked if she could be his female companion to attend the underground auction with the invitation, even the smart Edwin was stunned for half a second.