Gangkkо is a high-end set-meal restaurant in Nonhyeon, Seoul, serving altang and albap alongside flounder and crab stick sushi. At lunch, two pieces of sushi are included per person, and the altang contains roe and water dropwort. A separate lunch menu is available, and rooms and valet parking are provided. The altang is enough to eat with a bowl of rice, and the main dishes are on the expensive side.