I've never checked out fortune telling in Korea but it's too suspicious when there are so many of them. That's when you know its a scam, specially those over-decorated rooms with well-dressed ladies with too much makeup. In the end it's usually a girl thing to have their fortune told, as they want to know things like when they will meet their true love and when they will get married, and guys get forced to go with their girlfriends. Since even the people here know it's fake, they say you have to go to 5 different ones and if anything they say coincides then it's supposedly true.
I'm not about to pay 5$ per session for that though.