After so many years being here in Seoul, it was my first time to the flower wholesale market at Express Bus Terminal.
They are open from 12mignight till 12noon and apparently if you don't mind any kind of flowers and want it cheap, you should go at 10am when they are starting to "clear" stocks.
I went at about 7am because of work and also I knew that the flowers that I intended to get might not be on clearance anyway.
The prices are not dirt cheap (perhaps I wasn't a regular) but there are a good selections of flowers that you don't see around in your neighborhood florist.
Scroll to the bottom if you would like to see the video I took.