Board Thread:Questions and Answers/@comment-26107068-20151217013420/@comment-27281654-20151227171409

If you do a True Pacifist run before No Mercy, Sans will say that there's a glimmer of a good person inside you. Remember: it's never too late to change. Even if you've been a serial killer for the entire game, not killing everyone in Hotland will give you a second chance.