Where are some good restaurants in Mia or Ssangmun?

‌Since I'm on a weekday vacation for the first time in a while, I'm planning to have lunch with some drinks.
I see those 10,000 won buffets at traditional markets on YouTube, but I'm a bit skeptical about the quality.
There are also sushi buffets with unlimited beer for around 30,000 won.
Where would be a good place if I want to spend about 50,000 won plus for two people?
I'm planning to travel by subway, so somewhere near a station would be great.