One of the best places for a Western breakfast in Seoul. Butterfingers is a chain of restaurants that provide that down home diner feel. Plus they have ahuge menu of hard to find items like corned beef hash that make it an expat dream come true. With so much to choose from, huge portions, and quality ingredients you aren't going to want to miss this.
The only draw back is that it is quite expensive since they are committed to quality western ingredients which art cheap in Korea. However, since the portions are huge you are best splitting with a friend or date, so it works out in the end.