There was a knock on the Skeleton Bros' door, and since Paps is lazy, his little brother Sans went to open the door. With a big smile, wearing his usual outfit, Sans excitedly opened the door

"Who could it be?!"

He found himself confused when he saw a new face, he had lived underground for a while, but he had never seen this monster

"Huh? Who could you be?"

His face quickly turned back into a smile