Haemangul is a modern historical tunnel in Gunsan connected to Wolmyeong Park, about a ten-minute walk from Iseongdang. The tunnel was dug during the Japanese occupation, and bullet marks remain on its walls while cool air blows through the passage. Inside the tunnel there are chairs and a bicycle path, and past the tunnel you can see the old ferry terminal area, which no longer operates, and the fish restaurant area. There are no exhibitions or photo spots inside, so there is little to see.