Check in time ends at 9pm which seems unusually early for a city hostel on a weekend, so I called ahead when I booked and let them know that I would need to check in late since my train arrived later than that. They said okay and sent me an email with self check in instructions.
They said they would leave a key to my locker with my receipt on the counter, and they emailed me my room number and the keypad code for it and the front door. In the email it explicitly says "DO NOT CONFUSE THIS LOCATION WITH OUR OTHER BRANCH WHICH IS A FIVE MINUTE WALK AWAY ON THE 6th FLOOR. THIS BRANCH IS ON THE THIRD FLOOR..." There were step by step instructions for how to get to the third floor, where the lockers were, and what my room number and entry code was.
I got to the address they sent by email. Everything matched the instructions, but there was nothing out for me. I figured that's not a big deal, I had my room # and code-except that the code didn't work on the room number I was sent.
I spent over an hour sitting in the lobby, calling and texting them by phone, kakao, and Facebook at every number I could find. No one ever answered. Finally, stressed and frustrated, I decided it couldn't hurt to check the other branch-- the one I was clearly told NOT to go to. There was my receipt.
Today, four days after my numerous messages and 12 calls, still no one has responded to any of my attempts to contact them. As far as they know, I never got in, and they apparently don't care.