If you're planning a fishing trip to South Korea in late spring, there is one undisputed king of the seabed: the Flatfish (Kwang-eo). Known globally as Olive Flounder or Bastard Halibut, this species is Korea's "national fish."While the fish is the same, the tactics couldn't be more different depending on which coast you choose. Here’s everything you need to know about targeting trophy flounder ..