I booked a single room for consecutive 9 nights but on the arrival night, the staff told they somehow messed up the reservation and made me stay in a shared room of 6, promised me that I will get a refund of 20,000won which was the price gap between the single room and the shared room.
This already creates somewhat negative feelings for me to this hostel, the next morning, I did get a refund but I needed to chase it by myself and the owner seemed very reluctant while giving back my money.
I moved to a single room where it's not as big as stated in the website(it's said 6m2, but it was only half of the size actually).
The bed was quite stiff that it sore my back a bit and there was always a small flood from the 4F restroom, the wall wasn't soundproof so you will hear every single sound from other rooms and it interrupted my sleep.
I understand it's cheap and it located right in Hongdae, but the stay really wasn't so delightful.