In , Zuko returns to his country a hero thanks to Azula crediting him with killing the Avatar. Zuko suspects that Aang survived and hires an assassin to ensure Aang's death to cover up Azula's lie. He resumes his romantic relationship with his childhood friend Mai, but continues to feel guilty and uncertain of his decisions. After He learns that his mother's grandfather was Avatar Roku, Aang's predecessor, Zuko decides to turn his back on the Fire Nation and help Aang overthrow Ozai. He confronts his father about his cruel treatment and the Fire Nation's destructive effect on the world, before leaving to join Aang. Although they initially reject him, Aang and his companions grow to accept Zuko as a member of the group after he proves his loyalty to them. He trains Aang in firebending, and the two journey together to meet the last dragons, from whom they learn that firebending can be powered by the energy of life, rather than rage.