Gwangjang Market, a traditional market in central Seoul, is one of the most popular tourist destinations in the capital, offering a wide range of local foods and snacks. If you google the market, almost nine out of 10 reviews are about a petite-sized gimbap, or seaweed rice roll, with the intriguing name, “mayak gimbap.” "Mayak" means “narcotics” in Korean. Of course, nothing adverti.