This is my personnel opinion. I've seen this kind of question here and there. I don't think the weight and height are not such important factors. We Korean don't prefer chubby or glamorous shape, actually, we barely see those fat people or so.
You know, women's weight is very different even though they look the same height and shape. So, I believe this figure is useless and also such a standard is useless.
The important thing is that First, there are fewer obese people than other countries, second, there is no golden standard ratio. All you can see people on TV, especially idol, and the figure are just some kind of preference which doesn't mean you have to be.
The last thing I want to say again is, as I said, Korean men and women have a lower weight than other countries so we might look relatively lower standard.