Fermented food is abundant in Korea. To the milder dwenjang to the pros only, fermented skate.
My husband enjoys fermented skate. Per name, it is fermented to rot - and eaten with whatever however you would mask the ammonia stench - with kimchi or pork.
I've only tried a few pieces with "ssam" of kimchi and pork. It wasn't bad - but I wouldn't go out of my way to eat it nor order it - well unless I wanted to feel adventurous and drink lots of Makgeolli with it - to suffice get drunk.
One of the more adventurous eats is the fermented skate. If you are here, have a piece before leaving the country.
At least you will carry a badge around with you deep in your heart and ego that you once had fermented skate that stank like bottles of fermented piss.
Have yourself an adventure!