Jung Dayeon

The woman who kick-started the "momjjang" (hot body) fad in Korea, Jung Da-yeon.
This young lady transformed herself through exercise, and is known as an expert on physical training and exercise now.
She has released a popular fitness book, a DVD called "Momjjang Diet" and even been in a K-drama (in Korea) called "Aquarius".
Jung played a fitness instructor.
She has her own website, http://jungdayeon.com/ that is in Korean and Japanese.

And here are some clips from her TV show FIGUREROBICS from YouTube:

South Korean bodybuilder Mi-Hee Yu

Couldn't find a lot of info on South Korean bodybuilder Mi-Hee Yu other than she has had two children and started training AFTER she had them.
So yes, this is how cut and ripped this lady is after having kids.
I swear I cannot see how they do it.
Two kids, married and works as well.
Bodybuilding is basically an amateur sport in South Korea, so she doesn't get paid for it, she does it for the love of the sport.
But imagine having to manage her regular life, plus make time to hit the gym and watch what she eats.
My hat is off to these ladies that can keep that up.
And look this good doing it!