I have lived there for a couple of years already, rarely see any women dating a shorter guy (it is considered as unmanly for dudes) not to mention asians, there are many of them but tend to hang out in their own groups.
Im not saying its impossible, im just saying it will be hard and one korean guy is not a convincing example
Im not saying its impossible, im just saying it will be hard and one korean guy is not a convincing example