Kyujin K.
SerpAPI
I enjoy, drinking at Izakaya except I never really tried Izakaya in Korea because it is hard to find a good one.
Izakaya Sai, located in Kangnam, Seoul is fancy, and delicate Izakaya where you can enjoy your Sake, Beer or High Ball along with great dishes, mostly based on Seafood. A big pro of their seafood menu is that you can hardly see them anywhere in Korea unless you spend lots of money for Sushi Omakase.
So I highly recommend you to try here but be aware... they are Izakaya in the most expansive region of Korea.