Costco membership, and the annual fee is 35,000 won, which is quite expensive, so people are a little reluctant compared to E-Mart Traders
People don’t know, but there’s a way to use it without paying the annual fee
Beyond not paying, you can use it even when you get money from Costco 
You can sign up for Executive Membership
The subscription fee is 80,000 won, but you will get 2 of the amount you buy at Costco
If you shop for 330,000 won a month, the annual fee is practically free
If you shop for more than 330,000 won,
The more you buy, the more money you get from Costco, the magic begins shivering
There is a store that gives money to buy more things! (Singing “Bbooshoot