The Tainted Jade of Gusu

Lan Wangji doesn't trust the Jin sect with delivering the invitation of Jin Ling's six month celebration to Wei Wuxian without any conflict, and decides to go to Yiling in person to hand the invitation to Wei Wuxian.
What happens, when the two come close by a stroke of chance?
What happens when hidden secrets can't stay hidden anymore?
Between having to go through the loss and bereavement for Wei Wuxian and an unexpected pregnancy, how does Lan Wangji manage to make it through?
Years later, when he is reunited with Wei Wuxian once again, he struggles to let out the truth. What happens when the truth comes out? And what does it mean for their relationship?