Song lived with her mother in a village in a fairly comfortable home; her father was captured during a Fire Nation raid on their farming village when she was a little girl. She bore a large scar where a firebender attacked her.
When Iroh received a rash from drinking tea made from a white jade flower, Zuko escorted him to a nearby village to receive proper treatment in the local hospital where Song worked. She covered Iroh's rash with ointment while conversing with the two, who introduced themselves as Lee, better known as Junior, and Mushi, respectively. Noticing that Iroh and Zuko had been on the road for a while without proper nourishment, she invited them back to her home for dinner, but Zuko promptly refused. Trying to persuade them to join her anyway, she casually mentioned that that was unfortunate because "[her] mother always [made] too much roast duck." After hearing about the menu for the evening, Iroh immediately accepted.
During dinner, the conversation shifted to talk about the Hundred Year War. Song spoke of the hardships her family had been put through because of it. Zuko afterwards retreated to the porch, lost in thought about what the Fire Nation did to the world, when Song asked to join him. In an attempt to console him, she looked at his scar and told him that the Fire Nation had hurt her as well, referring to the scar on her leg; Zuko appeared shocked and sympathetic at this revelation.
As Zuko and Iroh prepared to depart, Song, in a last attempt to brighten up Zuko, said, "I know you don't think there's any hope left in the world, but there is hope. The Avatar has returned!" to which Zuko coldly replied, "I know." As Song went inside, she saw Zuko steal her family's ostrich horse; crushed and looking down in sadness, she closed the door.
Song was compassionate, trusting, gentle, and always willing to aid others. She showed a great amount of sympathy toward Zuko, upon learning about his difficult relationship with his father and seeing his scar. She tried to offer comfort and hope to those whom she felt were troubled.