I recommend the Shu Uemura Hard Formula in Acorn.

This is an eyebrow product I really love. It is a Shu Uemura product, but since all Shu Uemura stores have disappeared from Korea, you can only purchase it abroad or at duty-free shops. I bought mine at a duty-free shop as well, and since I have been using it for a long time, I am always satisfied with it! It looks natural and has great staying power, so I really enjoy using it. I recommend it.