What do I use coins for?

Slurp! You were curious about how to use coins, weren't you, hmph. If you examine it meticulously, coins are used in the store to purchase various gift certificates or gifticons. I'm kindly informing you, so please check the store wisely, hmm!

I'll buy the gifticon!

Is exchanging gift certificates with coins the purpose of making a profit?

If you collect coins, you can find gifticons, items, Naver Pay, etc. in the shop.