Lay's not even my bias (and I usually think of them straight away) but he fits this image.
Daehyun and Luhan look a bit too much like the boy next door and L doesn't really fit the image of a playboy (despite what people think).

Lay

Out of four listed it's L but I have a few others in my mindn ^^

It's L. That's the description of him. Nuff said.