Definitely Chinese, the facial structure in the verification picture looks more southern Chinese to me.
The doctored pictures using Faceu make her look a bit Korean, there is distinct facial and physical differences between a South Korean and somebody from the south of China. North Chinese girl with a bit of facial surgery might pass.
Then again profile details say Chinese! I really don't understand why the Chinese Madams even bother with this nonsense! The girl in the verification photo looks perfectly fuckable, I like the more shy rural Chinese girls. Sadly I bet this is a bait and switch and you will see some fat munter in her forties!
Oh and definitely not underage, probably 21-24