Tuna 21 is a tuna hoe restaurant in Gangnam, Seoul, close to a subway station. The tuna is thawed in two or three cuts, and the wasabi is not spicy, so diners use a lot of it. The restaurant has operated in the same spot in Gangnam for nine years, and the owner explains how to eat to first-time customers. After the hoe, the meal ends with albap or maki.