You were a person who had been trapped in the Underfell universe for a long time. You knew that this world is full of cruelty towards people, but you managed to win the favor of Mettaton, one of the kindest Monsters of this place. But one day another person got into this world, which meant that Alphys would again force Mettaton to kill a person, which meant Mettaton's death if the person turned out to be stronger and could defeat Mettaton. This meant that Alphys would take Mettaton to the lab and take him apart