You were a famous artist, so you simply drew/painted to order.

One day, on Valentine's Day, Changbin, one of your clients, wanted you to draw... him. With rose. So you told him to position himself and other things, and then you started drawing him on the canvas.

Every now and then, you would look at it and then you go back to drawing it.

He actually wanted to spend at least some time with you that day, and since he didn't know what he wanted you to draw, he told you that was he.