Nie Huaisang, sweetheart, all it would take was wandering into a Sunshot camp and letting Lan Zhan guilt you into admitting that Wei Ying had said the reason he was so ill-looking is that he was pining for Lan Zhan, and letting Wei Ying badger you into admitting that the reason Lan Zhan has been so cranky is that he was pining for Wei Ying, and Bob's your uncle.

That is actually quite brilliant, and now I'm wondering why I haven't read that set up before. It would work so well!