The thing about Wonwoo is, as his friends always point out, that he is such an open book. You will know how he's feeling once you look at him. He's also pretty much open about everything, like his habit of having one night stand. 

One night stand has always been Wonwoo's thing, his friends would know.

"I don't meet my one night stand partner twice, Soon. What would that be?? two night stand?? 

Another Saturday, one night stand, nothing new. 

"Hey." He calls out from the bed. The boy stops by the opened door and looks back at him. "Gorgeous."