(Update are slow but I will update eventually) This takes place in the atla universe when Zuko is working at the Jasmine Dragon tea shop just twisted a bit where Sokka meets "Lee" and falls for him without knowing he's Zuko (somehow) (sorry the time isn't accurate it's all over the placee it's honesty been awhile so I...
Sokka was captured by Fire Nation soldiers when they invaded his village. He got away from the soldiers, but only after they had left his village. He had no way to return to his home, so he's been living in the Fire Nation ever since. Zuko is kept hidden from the nation, apart from a select few. His father is ashamed...