Unrealistic fluff. Sometimes it's just what you need. If you like mills and boon romance with 50 shades vibes, go ahead and watch.
I don't get the haters of this little drama. Obviously it's not a masterpiece but no one ever meant for it to be one. It should be judged for the manga based fluff that it is, and then its kind of fun.
And yes, the guy is a bit short and skinny but he's still good looking and rather hypnotic. The girl isn't strong and modern for most of the drama, although she does get some backbone in the end, and again, in the rich guy vs pretty virgin trope you don't really expect some kind of valkyrie...