Episode 4

S1, E4: Peering inside the pitch dark hole, Dong Soo pulls at the rock, but to no avail. He looks to the Crown Prince for help, and they begin to pull together. As the rock moves, the opening appears, and they enter the cave. The following day, Dong Soo crawls from the water, coughing. At one side, the Crown Prince lies with an arrow in his body, appearing dead.