Astoria Hotel

I am booked to stay at the Astoria and on a hotel website, it suggests 605-1 to Sejong Hotel and a fairly short walk. Can anyone tell me if the above info is accurate, how much the bus will cost and provide directions from Sejong to Astoria?

Is there a better way to go?

Thanks.

Astoria Hotel

By the way, the Sejong Hotel website says the airport bus is 6015.

Also, about how far is it from the Sejong Hotel to the Astoria Hotel on foot?

Thanks.