If I want a quicky, I would go to the centre of my town, circle around the park for some time (since the park is not that big), and go back home. It is approximately 4km one day, meaning 8km both ways.
My favourite place around Seoul is around the Guro Digital Complex area and Hongdae subway exit #3.. there's a lot of things to sightsee while you're riding and it isn't too crowded by cars!
Busan is also a great place to bike if you ever happen to come to Korea!
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