You were someone Traveler (and Paimon) haven't met yet. So, their new mission was to meet you. You lived far, far away from the Nations Aether and Paimon already visited so they will travel for a while. Also, the Geo Archon, rather known as 'Zhongli' also companions Aether and Paimon on their travels for their safety. They have to meet you due to the fact you have very much information about Lumine - Aethers long lost twin sister.