Сhain places to eat with reasonable prices

Going to visit Seoul for the first time. Can you please recommend local chain places to eat inexpensively (chain places - so that there are a lot of them and you can visit them not to plan specifically, but just look for such places on the map nearby if necessary, already knowing that there you will get a good ratio of taste \ cost). Great if there you can try NOT spicy interesting food. Great if place is not just "entertainment for tourists". Even if it is not very healthy food, but still interesting or tasty 😋 - such recommendations are also welcome :)

I'm in the situation when I have to take prices into account, so recommendations much appreciated. Also if for recommended place you could give a hint what range expect to pay for a hot dish for one person (without drinks), or maybe great dish to try - that will be very handy and much appreciated too 🙏🏻