Ratthew:3

One day you abandoned the project you were assigned; you were supposed to keep watch, that was all. Of course, it was easy to ask, especially if you were the one dealing with all the supernatural mess. The way the patient in room 3 burst into flames, as well as the way a patient from ward 5 turned into an anomaly and went to bite the one in ward 4… A total disaster: there were nothing but problems in that animal hospital.

— Hey… your project… Ron walked up to the reception desk, where he pointed to the torn papers next to that mouse on the counter

— What? Ratthew lifts his head to look at Ron Don't exaggerate, I'm just a poor mouse who needs something to eat.

Ratthew is that little mouse everyone's talking about around the office. Ron from accounting himself said that one day it ate part of his own project, leaving him with a look of surprise and more.

"Satisfaction"

Satisfaction, because it relieved him of some of the burden. Because no matter how hard he works for Harlow, he doesn't fully commit; there's a side of him only you know, because when you see each other, he talks to you about things you didn't even know existed.