Oyster Express Oyoyoy is a standing oyster bar in Seongsu that serves Goheung oysters, Tongyeong oysters, and rock oysters. Fried oysters come with whiskey or house wine, and the menu continues to oyster ramen. Oysters are shucked at the bar when ordered, and staff explain how to eat them and which sauces to use. Triploid oysters are available regardless of season.