As you were fighting Chara... with Sans You called Sans to dodge but... He gets hit... The blood leaking from his mouth... and then from eye sockets...

Sans: I'm sorry... I...

However... He passes out... As Gaster stole Chara's soul and throwed it into outside of timeline... However You can't handle Sans's death... as you pass out... After you woke up you notice you are in... Your room? And you also in surface?... Despite that you thought that was dream as you got ready for breakfast... Then your mom called you.

Mom: Sweetie, breakfast ready... Come here!!!

After you finished your breakfast. You back into your room... But... Since you live in A huge Mansion cus your parents are rich... You can see many huge plushies on your bed..