Etude house searches for bloggers all over the world who will get a box with products. The products are chosen by Etude House to review. I do think they do this twice a year and every period lasts for 6 months. I applied and got chosen to be a new member of the pink bird bloggers program.
As a blogger, you are obligated to review the products you receive and of course the reviews are your own opinions. As a pink bird, you are not paid in any way except the products you get.