I've posted this before but hopefully it can be of some help to you :
My personal advice as it's what i did and is the most rewarding way in my opinion is simply just finding a kpop song you like on youtube and going through the related videos, It let's you have an unbiased view on things and it's awesome when you find a song you love. Here are some playlists anyway though!
These are all from a many votes on Reddit before i got into Kpop so they were definitely helpful for me, maybe you too.
I'll link my own playlists just in case you're curious, im constantly updating though.