Gyedan Ramen is only in two places, Ilsan and Magok (Ilsan is said to be the main branch).

They sell two types, Gyedan Ramen and Motsu Ramen, and I ordered the Gyedan Ramen (₩11,000)! You should try the basic option first to gauge how good they are :)

It's really delicious — the familiar tonkotsu ramen flavor everyone knows, plainly tasty with no divisive elements, and it's a flavor I want to have again! They also offer Damagobap as a side (₩4,000); add it when you're very hungry and it becomes a completely satisfying meal.

It's a popular spot and always busy, and the interior isn't very large, so you'll definitely have to wait during weekday lunch... If you're visiting, I recommend going on a weekday evening or on the weekend. 👍