Yosanjae is a vegetarian buffet in I-dong, as far as I am aware it is the only specialist veggie restaurant in the Namgu area of Pohang.
It’s a standard Korean buffet format, but it has quite a large variety of dishes including tofu, rice, mushrooms, soups and noodles. They also do some synthetic meats made from vegetable proteins, which are surprisingly delicious.
There are some dessert options too including rice cakes, fruit and various teas.
Highly recommended if you are a vegetarian, even if you’re not, it is really high-quality delicious food. It can quite busy around lunch time, I’ve not had any trouble going around dinner time.