From MC's perspective:
My eyes grew cold. I took a good look at Gutt's corpse before placing it inside the Gregor Mansion.
Then I started walking toward the mansion. The only flaw in the process was Senior Gilbert and Tony Burnett. These two people knew Gutt was accompanying me.
I didn't care about Tony Burnett. But when it comes to Senior Gilbert. I already thought about the perfect lie. I will shift the blame to the dark league.
Several minutes later,
I entered the small mansion again. Seeing that the old man is not there, I signed inwardly. Then I walked back to my room.
Time passes in a blink of an eye,
8 P.M
During the night time, the merchant old man came back.
After seeing me he asked, "Who are you?"
Then I realized he didn't know about the transfiguration potion. Then I told him the truth.