wow, only 9 days...
If it were me and I knew how to get around Korea fast in 9 days, I would do this...
Seoul for 2 days. It has it all! There is a great sport area called Surisan and also the granite domes of Insubong, Suninbong and Donbongsan in Bukhansan national park. There are some serious quality lines.
Seoraksan 2 days. It is amazing! Granite multipitch for the most part, but you can find a few sport crags around too.
Then to Yeongso Pokpo for 2 days. There is a waterfall and some great sport lines that can also take gear. Most are single pitch. This place is my fave, (watch out for busy weekends anywhere). Koreans love their outdoor sports.
It`ll take you less than a day to get to each of these areas. If all you want to do is climb, go for gold!
cada camino es otro destino. todo depende de cual quieres tomar.