Frisk entered the Last Corridor, out of breath from trying to reach the end so quickly. Beyond her was a beautiful golden hallway with granite pillars of the same color holding everything up. Glass windows stained with the mysterious "Delta Rune" symbol was strewn everywhere. She had a feeling this would be her last chance to rest before she reached Asgore. She walked along the long corridor, thinking about her friends.

Papyrus was the hardest-working skeleton she had ever known. Despite any drawbacks, he always found a way to motivate himself to keep moving forward. He was always trying to find ways to get everyone to become friends. Had it not been for Papyrus's suggestion, Frisk never would have come with him to Undyne's house and she never would have become so close to her. He had been a confidant throughout her journey and always picked up the phone whenever she called. His kindness resonated through her very soul.

Undyne was the most determined monster in the Underground. Even when she was bent on killing Frisk and using her soul to cross the barrier, Frisk know she was doing it because she cared about every monster in the Underground. All Undyne wanted was to try her best for her friends and the people she loved. Although she seemed tough and scary in the beginning, she really did care about Papyrus, Alphys, and Asgore. Undyne would beam whenever she talked about the three of them. All she wanted to do was protect Papyrus from becoming hurt in the battlefield. She wanted Alphys to realize how amazing of a person she was and wanted to relieve Asgore of the pain of having to gather 7 human souls. Undyne's caring personality resonated within her.

Although Alphys had confessed to Frisk that the Mettaton event was staged so that Frisk would become her friend, Frisk accepted Alphys's friendship nonetheless. She admired how dedicated Alphys was to her research and that she wasn't afraid to show her nerdy side. Frisk herself was also nervous talking to new people and she sympathized with Alphys's social anxiety. Despite this, Alphys was able to overcome her phobia to guide Frisk through Hotland and to the core. Alphys' ability to push through her weaknesses shone through her soul.

All of a sudden, in the middle of the hallway, a skeleton figure appeared out of nowhere. She recognized that skeleton anywhere. Light shone through the corridor, and in front of her was Sans. Her heart skipped a beat. She was about to smile and run up to him, but his demeanor signaled to her that he was there for a very different reason.

Sans greeted Frisk and explained that he had the power to see a human's EXP and LOVE. A strange feeling filled Frisk at that moment. She had never seen Sans so serious before. Up until that moment, they were close friends, always laughing together and hanging out. This time, however, she felt as though Sans had been judging her every move since she stepped into the Underground. It was the same feeling she had when he snuck up behind her in Snowdin.

"Welcome to the end of the Underground," Sans said. "I am here to judge you on your journey so far. As you know, I've been watching you since you stepped out of the ruins, seeing how you interact with monster-kind. Had you been a killing-machine, I would have been forced to use my powers against you. The previous six humans before you did not heed my judgements, and they were rightfully punished with death by Asgore." Frisk started to get scared. Was Sans going to kill her right there and take her soul to free the monsters? Was their friendship just an act to make her vulnerable enough to kill in one hit?

She froze.

"However… The more I watched you Frisk, the more I realized you had not one bad bone in your body." He chuckled to himself at the insertion of a bone joke in the middle of their serious conversation. "You've shown me how much of an amazing person you are, Frisk. You cared about each and every one of us: Papyrus, Undyne, Alphys, Mettaton… We have never seen a human as amazing as you. You always strive to do the right thing. You… you made me care about something again. You. I really care about you Frisk and I don't want to see you have to fight Asgore. But… I know you have to get home. You don't belong here. You have a life on the surface. So I guess… this is going to be my goodbye. I've never been able to talk to anyone as openly as much as you. I've had so much fun with you the past few days. It's going to hurt when you leave but I know you have to. You're amazing Frisk, and me and the rest of the Underground will miss you deeply. I know you're going to do the right thing."

"Sans…" Frisk said. "You've been such an amazing skeleton to me. I really appreciate everything you've done for me. You and everyone else. At first, I just wanted to get out of here as fast as possible, but the more time I spent with everyone, the more I realized how amazing it is down here. I'm really going to miss you guys." Frisk hugged Sans. "Goodbye, Sans." Frisk walked past Sans towards the next corridor. Sans remembered what Grillby had told him. He tried to muster all his courage to turn around confess his feelings to her before she left. He wanted to scream for her and tell him how much he loved her, but he couldn't bring himself to do it. He was too scared.

Sorry Grillby, Sans thought. But I don't make promises.

Sans closed his eyes, thinking of all the wonderful times he had with Frisk. The pain was starting to set in. Starting from that moment, he would start his life without Frisk. He knew it was going to happen one way or another, but he wasn't truly prepared for the gaping hole he felt inside of him. He only wished that she was still there when he opened his eyes, but he knew she would be long gone when he turned around.

Sans opened his eyes.

"Sans!"

The sudden voice jolted him awake. What happened? How many minutes had passed? He knew he was waiting for Frisk at the corridor.

It was that same feeling. A reset.

Sans realized he lost about the last 5 minutes of his memory. Or had it been more than 5 minutes? He didn't know. All he knew is that Frisk was standing in front of him again. He only remembered the pain of her leaving and was not ready to experience it for a second time.

Frisk spoke. It was his triple-secret codeword. Two resets? So she had been the one messing with the timeline this whole time. He chuckled to himself.

"You sound so stupid right now. Who that hell told you to say that?" Sans winked.

"Some bonehead," Frisk responded. "Listen… Sans, I'm not ready to leave the Underground yet. I want to stay with all of you guys. It's been so wonderful for me down here. And I don't want to have to kill anyone just to let myself leave. I've known for a while that I had to kill Asgore to leave, but I don't want to, Sans. I can't. I'm not a killer. I'd rather stay down here than become a killer just to get out."

Sans blinked. He was shocked. Frisk wanted to stay?

"What about your life on the surface? Your friends and family. Won't they miss you?"

"I want to spend more time with the people down here. They can wait."

Sans wanted to cry of joy. Whatever timeline this was, he thanked whatever deity was controlling his life that this was the timeline he ended up in. She was willing to give up her life on the surface just to stay true to her ideals. Something must have happened for her to have to reset twice, but whatever it was, he was happy she decided to stay. He put his hands on Frisk's shoulders.

"Since you're staying, I'll give you a ride back." Sans teleported both of them away from the edge of the Underground.