[Body temperature caste system + extreme male competition + survival infrastructure + hard core physiological settings]
Lin Qian, a top technical diver, encountered a thermocline fault in a blue hole in the Bahamas. When she opened her eyes again, the world had been cut by a vertical "temperature wall" - a permafrost glacier of -40°C on the left, a scorching desert of 50°C on the right, and she was stuck in the death fog zone of 0-25°C.
In this world of beasts where caste is determined by body temperature, endothermic species are nobles, ectothermic species are untouchables, and mixed-blood "temperature crackers" are considered disabled. Only Lin Qian has the ability to go from suspended animation at 32°C to high-heat exercise at 40°C, becoming the only "living key" to walk freely in the four areas.
When the permafrost young snow leopard shed her ice armor and trembled in a 20℃ environment; when the leader of the rattlesnake in the scorching circle burned his life and trembled to produce heat, just to accompany her into the cold zone; when the ocean merchant built a mobile aquarium for her, and the twilight thieves built a mobile greenhouse for her - Lin Qian discovered that he was not only a "human air conditioner", but also a doomsday switch that broke the temperature zone barrier.
"I won't be your human body temperature matchmaker." Lin Qian held a diving dagger and chuckled at the body temperature auction. "I want to teach the world how to breathe like me."
From surviving in the mist to establishing a different temperature bank, from body temperature currency to temperature zone theology, she established a body temperature contract with four top orcs, looking for the 22°C where ice and fire can coexist in the absolute temperature difference.
