I have been checking on birding in Korea or nearby before next year's Congress. I won't bore you with all the details (contact me if you want the details), but August is not ideal for birding in Korea -- a little too early for migrant shorebirds, etc. Some local species, but not the ideal time. I contacted a tour operator for suggestions (who confirmed August in Korea is not optimal), and he suggested spending about a week in Taiwan -- short, fairly inexpensive flight from Seoul, lots of endemics, easy to bird, good infrastructure. Likely about 150+ spp in a week or so. If anyone would be interested, contact me and we can see if it is worth organizing. I have lists and photos of species possible.
In addition, I still may try to find a few days right before or right after the Congress to look around Korea -- the south coast southeast of Daegu, or a few areas near Seoul. If interested, I can provide some resources.