DO IT! Life is short, and you might as well see as much of this World as you can. Seoul is a beautiful and cosmopolitan city. Plus it is a great 'hub & spoke' for Asia. Heck take a quick train ride down to Busan and then the ferry across to Fukuoka in Japan. Have a beer and watch a Flames game with a Flames fan living there
edit: LOL... I only read your first post and replied to that. Seems you did not need my advice after all