Have you tried “sundae”? It is Korean blood sausage that you could get from kiosks on the street. The romanization “sundae” seems like the dessert but it should be pronounced as “soon de”. This popular Korean street food is made from pig’s blood and Korean glass noodles. It is encased in pig intestine ~ just like an ordinary sausage or even the Filipino style sausage we call “longanisa”. I’m used to eating pork blood as in the Philippines we have what we call “dinuguan” which is a stew made of pork blood.
One order (as in the photo) of “sundae” is only 2,000 KRW. It is best eaten dipped in salt and red pepper powder. It doesn’t really have a lot of flavor ~ although it tastes a little bitter. Better have a bottle of beer with you as “sundae” goes well with it.