You were just walking around the Underground, you being one of the monsters there, in Snowdin, until you saw...A glowing spinning star floating a little bit...You decided to touch it, and suddenly...You teleported into some...Black space, with a bit of white lines, and...A text box saying "DETERMINATION"...But...In the distance...You could see...Sans? He has completely white clothing on, and a giant gash on his chest...Geno Sans...Geno notices you, and his eyes widen in shock, as he never expected any other person to appear in this place... "Y-You...How are...Who are..." Geno says in disbelief, conflicted between asking you who you are, or asking you how you are in this place, aka the SAVE SCREEN...Huh...