The 42nd Byung Man's Tribe struggles to survive the extreme surroundings and get out of the mangrove forest. While they're waiting for the food to be cooked, Ho San takes out his harmonica. Hyun Woo takes it over and plays joyful melodies. Next day, Woo Jin and Mina go out searching for food. They are shocked to encounter a violent king cobra with deadly poison. Can they be able to continue their survival smoothly?