He looks over and smiles at the other man. "Good morning, Lan Zhan..ah..is it morning? Maybe it's afternoon by now.." He looks towards the window that Lan Wangji had been staring at but that isn't much help either. He can only assume what time it is so he will go with his first assumption of it being morning.

Either way he thanks the bartender for the drink that has just been delivered and takes a nice long swig of it.