I was thinking more why Kunlun, who had been mostly emotionally open with him and Da Qing, came up with that "don't be so demonstrative!" line at their parting. Once Shen Wei gets to know Zhao Yunlan's defences and performance, maybe there's a time when he thinks about them in terms of Kunlun...? Where he goes, "Actually, that was a sign of Kunlun's deep feeling that he had no other way to express"?