Ruon-Jian was Chan's best friend since they were kids. He was similarly confident and conceited and acted like a jaded rock star. He often communicated with just a flip of his hair or a subtle shrug. He was part of the Fire Nationelite on Ember Island.
When Ruon-Jian was young, he became best friends with Chan and remained as good with him for many years.
In the summer of 100 ASC, Zuko, Azula, Ty Lee, and Mai arrived on Ember Island, Ruon-Jian and Chan were very impressed by Ty Lee and Mai's appearance and skill during a game of kuai ball. Chan invited Ty Lee to attend the party he threw at his house that evening and Ruon-Jian extended the invitation to Mai. Azula managed to get herself and her brother invited as well by Chan, with the approval of Ruon-Jian.
Arriving early at the party, Ruon-Jian gave the foursome a warm welcome, much to Zuko's annoyance. The prince of the Fire Nation acted very jealous on his comment, asked Mai what she thought of him, and accused her of liking him after, saying that she did not have any opinion about him. Later, Zuko's irritation was increased to a breaking point when he saw Ruon-Jian talking with Mai after he had left to get her some food. The jealous Zuko quickly intervened by pulling Ruon-Jian away from Mai. After he fixed his hair, Ruon-Jian tried to reason with him by telling him that he should relax as it was "just a party". Zuko did not take this comment well and he pushed him into Chan's nana's vase. As Zuko left the party, Ruon-Jian taunted him by calling him a "loser boy".