Whenever someone tells you "you must try" the pork bone soup at the Owl of Minerva, kindly ask what time they ate there.
Sure, the Owl serves a decent pork bone soup. But it's only really worth a rave after 2am (when the better spots a few metres away close shop) and after a few drinks. Kinda like a lot of 24-hour joints, availability plays a serious factor in rating the quality. And I don't know of a lot of 24-hour Korean places if you catch my drift.
Still, if you have a hankering post-bar, GO! You're sure to have company, since I've seen people through the window slurping up the (overly clear) broth as late/early as 5am. Personally though, I'd rather a snack and wait for one of the many, many better options.