The war had already come to an end, the nations lived in harmony again. But still, Aang felt an emptiness inside him. He was happy, but at the same time he felt sad.

Aang decides to visit the air temple that was once his home. Visiting the graves of other benders who had been his teachers and friends.

But upon arriving at the temple, Aang realized that something was different, but he didn't know what. Aang hears a mysterious melody and follows the sound, wanting to discover its origin.