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I just thought about something.
EXP in Undertale is something used to quantify the amount of pain you inflicted to others.
LV is something used to quantify how much you can hurt someone, your capacity of hurting increases every time you hurt because the more you hurt, the more you distance yourself, the more easily it is for you to hurt again.
This is the basic, right? Along with the fact you will hurt more if someone doesn't expect you to hurt them and therefore you will gain more EXP. This is shown with betrayal kills, and it's a popular thing in the fandom to say that you can gain EXP without killing by hurting emotionally. Example, Glitchtale. Another common thing to assume is that you can also increase your LV without actually hurting anyone, like in Undertale Yellow Genocide Route (Axis battle).
But is it possible for you to lower your LV without lowering your EXP? You can't change the fact you hurt them, you can't change the past, but if you somehow unlearn all the things you learned on hurting them, if you get close to them again, if you open yourself, would your LV lower? But most important of all, wouldn't it be as cool as heck? It's like a statement that you did mistakes, yes, but you are willing to amend them. In spite of those who say they can't change. Yes, you can. Stop saying you can't. This headcanon is going to make it into my story, it's just so cool.