Perhaps they had. Wei Wuxian is a bit too addled in this moment to ponder it, but Jin Guangyao had held a garrote to Wei Wuxian's throat and declared he held Lan Zhan's life in his hands. And when he considers the gentle threats Lan Xichen had leveled his way...it is very possible that only Wei Wuxian did not know.

"Lan Zhan has special eyes," he murmurs, brushing at the edges of them now with his thumbs before he kisses him tenderly. If he is beautiful, only shijie and Lan Zhan have ever said so. "He sees what others do not."