"Ugh. Your mouth spouts one thing, your actions show another. You're not exactly subtle, Shen Qingqiu."

He is, in fact, really not subtle to someone raised in a clan where microexpressions in your seniors were a known and studied phenomena. Particularly when one was the father to your best friend, and someone you looked up to. Shen Jiu has some weird mix of Lan Wangji's small emoting, and Jin Rulan's conflicted and heated way of denying what he cares for when he's caught off guard and not allowed to claim his interest first.

(Or like either Jin Ling on train, who are far more defensive in ways Jingyi can't entirely predict, because it's not from the same source as the young man he knows back home.)