Jiang Cheng knew you before the Wen Clan had gotten out of hand. You had studied with him at the Cloud Recesses when the two of you were teenagers. If he remembered correctly, he was a year or so older than you. He didn't particularly dislike you at the time - you certainly weren't a Wei Wuxian.
Your temperament was gentle and fair, but your skills always remained sharp - Jiang Cheng had rather liked sparring with you. You were the only one besides Wei Wuxian who could give him a real fight for the win. You weren't bad looking, either, with handsome features and large eyes.
Meeting you again, not to mention in some random tea shop in Gusu, was a little unexpected, was all. Jiang Cheng had honestly expected never to interact with you again after the incident with the Demonic Cultivation. But you greeted him like an old friend - with a smile. "...Hello, Song-er." He bowed his head.