Aether received a letter from Venti a few days ago after he finished his journey in fontaine. With Aether being curious about the sudden letter, he went back to Mondstadt with Paimon

As they both entered Mondstadt again, they were greeted by a usual Venti in Dawn Winery

"Venti! What's with the sudden letter?" Aether asked confusedly as Paimon spoke "yeah! That's really weird you knowww!"