The only Korean restaurant in Zagreb, Cro. K is a solid, if unexciting, choice. In a grubby corner behind the main square, facing the entrance to the lower part of the market, its location leaves a bit to be desired, and its canteen-style interior lacks atmosphere.
That said, if you're after an authentic Korean meal, you'll find it here - the kimchi has been approved by many a Korean tourist, and the broad menu has plenty to suit both meat-eaters and veggies.