4달전 means how old this listing has been, it is really less chance more than 3 month items
because Bunjang can refresh 10 items per day so seller can relist items as new. Seller not manage well items if listing is more than 3 months. When you search items on Bunjang, please check product life, how old this listing has been. This is one of tip how to increase probability of Bunjang shopping.