Zuko

You and Zuko didn't get along either, since you were adopted and that's why you didn't get along with Azula either. Zuko's mother adopted you but never revealed that you were from the water nation, after that since you were little you secretly practiced waterbending and to hide that you also practiced firebending

In the afternoon Zuko came into your room, you didn't know why, he probably came to tell you the same old thing, that you were adopted, useless, etc... You simply heard him come in but you only waved your hand to greet him

-"You look at people when you greet them"

Your older stepbrother, Zuko, told you