In the future world, due to environmental pollution, humans contract a strange disease that causes them to fall into deep sleep when the temperature drops below 10 degrees. To this end, the government stipulates a four-month hibernation period every year, during which all production and social activities cease. But there are a very small number of people with genetic mutations that do not require hibernation, and those who enter hibernation will become their prey... How does this happen? What shocking secret is hidden behind it? What is the truth?