The mission for the third key begins at Tonina. The brothers visit the Mayan pyramids located at Tonina and explore the ruins. They also visit the Tonina Museum to look at artifacts and to find hints related to their fourth mission. Back at their lodging, they prepare a Korean dinner with sausage stew and tteokbokki, which they improvise with local ingredients.

• Park Sang-hyuk

• Juyeon
• Cha Seung-won
• Kim Sung-kyun