Be prepared to have plastic surgery done. There has been some sort of connotation with plastic surgery these days where it has been generally been defined as something that you could see quite clearly. In all actuality, the best plastic surgery are the ones that can be brushed off as simple "growing up." Take the example of Goo Hara. She doesn't look different from her childhood days -- almost all of her changes could be the result of growing up/well. However, she admitted that she had her eyelids, nose, and mouth done! It is important to note that plastic surgery is rampant in South Korea, even among common citizens, to the point where many of the residents in Seoul believe that its similar to "buying an expensive handbag" or "putting on makeup" (everlasting makeup =.=).

If you are severely against plastic surgery, there is a chance that you may still debut under a company (for instance, YG). However, companies such as SM will most definately strongly recommend you take PS even if you are incredibly good looking to begin with. And when I say strongly recommend I mean do it or else you won't debut. Also, if it is your dream, wouldn't you do anything to achieve it? So, simple plastic surgery shouldn't be that big of a deal.

Guys are a bit off the hook when it comes to plastic surgery; on one hand, girls are not. Also, if you dont have double eyelids, be prepared to get surgery and if you dont have a V-line or an egg-shape (if you're curious what an egg-shape looks like, its pretty much Yoona's face shape) be prepared to get jaw reduction. Guys don't necesarily need to have double eyelids or a V-line, I would say its a good 50-50, but for girls -- there are a couple (like 2 or 3 or maybe even 4) that don't sport double eyelids or a V-line.

Now, I'm not saying that you will 100% absolutely be forced to take PS, but being prepared for it is very smart and important. To truly want to dedicate your life to something, that means that you have to understand its consequences as well.