bike Seoul ?

Hi everyone,

I am from Shanghai and do quite a bit of (group) bicycling there, either night rides on weekdays or weekend trips out of town. I plan to come over to Seoul for one long weekend in August and thought about bringing my folding bike to get around Seoul. That worked great in Tokyo in April and I wonder if someone could give me advice about biking in Seoul? Which would be bike friendly routes? Are there bike groups or other organized rides in Seoul over the weekends?

thanks, Roman