Board Thread:General Discussion/@comment-27524978-20160210030742/@comment-25748582-20160606024728

Everyone thinks that Sans has one HP. He has 1 HP in the game files, but Toby Fox revealed it wasn't canon. I don't have the source but I know it's true. Also, if he has a lot of EXP he could just be feeling guilty and not wanting anyone else to repeat his mistake. Kind of hypocritical, you might think, but not everybody's perfect.