[OlleTO]

This is from a friend with a similar problem who talked to a guy working with the feature, so YMMV:

Supposedly, the feature works at least in part by analyzing your playlists and giving recommendations based on what the people with similar songs in their playlists have there as well. He claimed to be receiving less Finnish rap m after removing his playlists with northern Swedish rap, so you could try that approach if you still have any Chinese/Korean playlists.

I just remove the few offending songs from my discover weekly, which I don't find too much of a hassle, but it doesn't seem to learn from that.