Cornerstone is an Italian restaurant on the second floor of Park Hyatt in Samseong-dong, Seoul, serving course meals and a brunch buffet. The menu includes seafood, bakery items, risotto, and flounder dishes, and on weekends the dessert section runs as a buffet. At breakfast, ordered menu items are cooked and brought to the table, while juice, milk, bread, ham, cheese, and fruit are taken from the buffet. An open kitchen is located inside the restaurant.