1. Core settings
Era background: In the near future of 2035, science and technology are advanced but ecological crisis is emerging.
Core scene: "Emerald Atoll", an unknown archipelago in the South Pacific, covering an area of about 15 square kilometers and with complex terrain
Time span: 3 years (1095 days) from crash to rescue
Core contradiction: competition for survival + emotional entanglement + game of human nature + unknown threat
