C299 Grace's identity?

It was entirely Tang Lin's intention that Gres would hide in the carriage and monitor the entrance of the Night Hotel.

At that time, in room number 8, before Migachell and the rest arrived, Tang Lin had called Gres over to monitor them. It was because when Tang Lin was thinking about how to lower the guard Migachell and the others had against him, he thought of changing into Gres