Seoul Metro

It's super easy to use and I highly recommend it^_^!!!! If you're planning to go around all day, you definitely should use it. It's such a great value for taking trains and buses in Korea, there's no reason not to use it!!!!! Please use it when you come to travel or on days when you're going to many different places.

I recommend WOWPASS, and the cashback is a nice bonus too.

I recommend WOWPASS

I was able to go in without waiting to buy tickets