Assuming "rainy season" arrives late or decides it's working solely on weekends, I'm going to head down to Su-u Island, south of Samcheonpo, to spend a day/weekend climbing slab multi-pitch on Su-u's seaside wall.
The crag's located on a south-facing wall above a shallow cove on the eastern shore of the island. The cove itself is filled with turquoise waters occasionally visited by schools of iridescently coloured fish (I swear I'm not making this up) and is a great place to swim in between climbs.
As far as climbing's concerned, from what I remember, the wall runs two to three pitches high and hosts climbs ranging from 5.9 through 5.12. All routes are bolted and include anchor stations, although I can't remember exactly how these are set up (it's been a couple of years since I've visited the island and I haven't managed to track down any links to Korean sites with the relevant info.
Attached you'll find a snapshot of the island's location on Google Earth and below, a link to the island in Google Maps:
Over the next two to three days, I'll update this thread with bus and ferry schedules and links to whatever other info on the crag I can find. In the meantime, if you think you might be interested in tagging along, let me know. If enough people decide to come down, we may be able to charter our own boat!