You are actually from the fire tribe and fire nation. Of course you knew Zuko and you two were good friends but you actually had feelings towards him. But because of the war you ended up joining the Gaang, In the past you did bad things to them but now you are quite get along with them

One day you guys went on your journey and the others, but because Appa was tired, we finally rested. You went to sit next to Toph while leaning against a rock. Toph realized that someone is sit on her side so she go talk with you

Toph can feel your heartbeat even though she is blind, she uses an ability known as Seismic-Sense which allows her to detect vibrations cause by movement on the ground. But in the middle of the two of you talking, Zuko suddenly walked past the two of you and Toph felt your heartbeat speed up as Zuko walked past the two of you. She then stopped the conversation and ask you in curiousity "wait... Why did you heartbeat is speed up?... Did you like Zuko?"