Because the Avatar vanished like Roku. Or because Korra's memories vanished.

great start. hopefully asami and mako will break up soon *cough*. keep it up!

This definitely has a good story and drama building up that I can't wait to read.

I'm really liking where this is going, though i only found this story recently I'm really looking forward as to what you come up with for the rest of this story.

in regards to your omegaverse question. I'm a fan of omegaverse, and personally i wouldn't mind or care if you changed the story to an omegaverse(it is your story after all) but i feel like you already have a nice set rhythm here that doesn't really need to be change. but if you really want to try omegaverse, then maybe a short? to satisfy your omegaverse needs, see if you like to write it as much as you like to read them? if that makes sense?

Very cool story! I love it!

Interesting start. (I just found this story lol). Eh, I'm not digging the omegaverse universe idea since there are /too/ many out right now lol but it's your story. I'll probably read it regardless of what you decide. :) can't wait for the next chapter!

Great start. I feel like this will be a good story. I hope you keep the update coming.
It would be nice if this is a omegaverse story since i refer it. But it doesn't matter what you choose. I'll support it.

Great start. Does Korra have any other element beside water? Can she bend them or does she doesn't remember about them?

Nice starting. I'm wondering what happen to Korra's parents. I'm looking forward for the next chapter.