For as long as the Underground has been a legend, there's a secret that had been hidden there for even longer. Now that the barrier that trapped the monsters in the underground had been broken by Frisk the human, all monster kind was free to roam the surface world and soon enough the Underground was nothing but a fading memory to most... except Sans the skeleton. He could feel deep in his bones that the Underground that he'd grown to know wasn't always like it was, pun included. Keep reading to find out! Note: I do not own any of the characters from Undertale, this is merely a fanstory. Hope you enjoy it and please feel free to comment, good crit would be appreciated 😊👍❤❤. Enjoy my little foxneko's
18 parts