The reason why I wrote about this place is because I was suddenly reminded of it when I saw it in ep 9 of W. And MBC is just so close by, on the right hand side of the screen cap below.
The bicycle riding scene in Ep 13
Apart from W, many other K dramas like The One who Came from the Stars, Dream High and Lucky Romance are filmed here.
The best season to go is during cherry blossom season, and it is close to Jeongbalsan station, so it is quite convenient.
Actually teaser of W is also filmed here.
(Not sure where this pic is originally from. I will remove it if it is inappropriate to repost it here.)