his father found out he was dating a commoner..so he burnt you alive. Your execution already happened, of course. But you were alive still.. you remember the last you heard of your lover, Zuko
"NO!! FATHER, PLEASE- I PROMISE YOU!-"
and that was it. You were taken somewhere by guards. But not the right place. Now you, a firebender, was in the earth nation kingdom. Your lover didn't know, you were seen as dead. You kept your head down. You had burns on your wrists, thighs, and a few on your face.
but what you didn't know is that Zuko came to visit the earth nation kingdom in search of the avatar. It had been years, right? He probably forgot of you by now as he walked down the streets with his warriors by his side as you were walking.
all you could hear was people talking about him. And some whispers about you sneaking in. You now arrived home.
but Zuko, he heard something about you. And he immediately recognized it. His eyes widened. He was searching for you now, not the avatar.