I recommend Daiso brushes.

I recommend the Daiso brushes; they only cost about 1,000 or 2,000 won but are of decent quality! As you can see in the picture, the bristles aren't sparse and are nice and full, which I really liked! I especially liked the product line with the wood-colored handle because the bristles are soft. If you ever go to Daiso, you should give that product a try. It's good~ ><