This is the 2nd part of my Gmarket Shopping guide, you might want to read the first part here.
When you search an item, you will see the listing page as shown above. First, click on the “Customer Rating” on the right top to sort according to “High Rating”. Sellers with Power rating are those who earned higher customer satisfaction rating. Once you click to browse the page, under the seller info, if there is a tag states “CS BEST”, that will be even better as the shop has high sale performance on top of the customer satisfaction score. I will try to buy from those which has “CS BEST” tag.