That all sounds completely ridiculous but Wei Ying would not lie to him about such a thing. Which only means that Lan Zhan is a monster when inebriated, a monster with no sense at all.

"Must never drink without Wei Ying," he intones, nodding to himself. "Or at all."

It has apparently resulted in theft, vandalism and self branding and he is not even sure what else he does not know. It could have been anything. It could be all manner of lewd and terrible things.