You were the 7th Human to fall into the Underground, you had fallen by accident and landed near the entrance of the Ruins. You were a month early before the original human, named Frisk. You weren't into genocide like the others; you get up and start walking, passing through the Ruins, you see a lot of dust piles one some parts of the ground. After getting through the Ruins, you enter Snowdin and see a Skeleton, but . . . he's changed, he stabbed a monster, that you see, with his sharp bloodied bone in his left hand. You look around a bit confused and scared but was still determined to figure out what was going on. After Sans gains more LV, you look around and then, he (Sans) see's you, you may think this is the end but this is just the beginning.

Sans: ". . ."