Found this Gukbap place called Onsuban ์จ์๋ฐ, which have a few outlets across the city.
Serving authentic and decent beef noodle. The rice noodle is soft and you can pair it with some sauce provided.
The soup was clear but tasty, as well as the beef was tender and easy to eat.
You need to order from the kiosk outside the shop and they will call your number to go in once thereโs seat.