There are no towels. Not even hand towels. Only face towels. I had to buy a beach towel from a souvenir shop for my showers.
Staff ivery nice and helpful, though like most places on Hamdeok beach it’s far better if you speak Korean. They had only basic English.
There’s a free washing machine downstairs though you need to bring your own detergent (or buy it from the desk for 1000 Won)