There was no way the old contract Jiang Cheng found arranging a marriage between the direct disciples of the Nie and Jiang sects was, as Jiang Cheng insisted, the way to solve the problem of the Yiling Patriarch - if only because there was no way the Nie sect would agree to it. Except - they did. And now they're coming to discuss terms. With Lan Wangji as the official chaperone.

Lan Zhan had never expected to marry. So of course, fate would have it that he was wed to Wei Ying's beloved shidi, just as they had become close, somewhere between friends and companions. aka Canon Divergent AU where coreless!JC marries LWJ, complicated feelings ensue. Eventual zhanchengxian.