Evening tours around Seoul?
 

Flying in at 4:30pm for less than 24-hour layover. Already have free transit tours set up for the following morning, but was hoping to take a guided tour that evening as well.

So far, I've had trouble finding tours for the evening. Ideally, I would like to walk around the main central sites.

EDIT: One of the problems is the few tours I came across (i.e. Viator) are for a minimum of 2 people per reservation.

Most main touristy things close at night. However, you might consider doing a Food Tour. These are at night and give a glimpse into Seoul at night. The The Dark Side Of Seoul/tour is an actual tour at night and might be worth checking out.

These 2 look decent, but the website doesn't allow submissions if less than the minimal number of people.

http://cosmojin.com/eng/special-city-night-tour.asp

http://cosmojin.com/eng/driving-nigh...asp?menu_idx=8