The setting is ABO/Doomsday/Zombie/be
In the year 3000, the earth's environment was already very bad. The greenhouse effect caused global warming and glaciers completely melted, causing some viruses that had been sealed for a long time to reappear. One of the ancient viruses would cause the infected person to rot and die quickly, and then suddenly return to life. Scientists call this phenomenon resurrection. After resurrection, the infected person will begin to crave the breath of living people and heat, bite and scratch, and the infected person will completely lose even their sanity and consciousness. But the person bitten will not be infected. Scientists named the virus B677. After the outbreak of the virus, scientists developed an atmospheric control substance called A919. This substance can lower the atmospheric temperature and weaken the greenhouse effect. It can also delay the infection of the B677 virus. During the mutation time, human society seems to be gradually returning to normal. However, the temperature dropped by A919 is gradually uncontrollable and gradually drops to below zero. The side effects of A919 are far from Not only that, it will also infect those bitten and caught by B677 with the same virus. Scientists called it B678. After the B678 outbreak, human society completely collapsed, and the global temperature gradually dropped to below zero. The survivors opened shelters underground to implement the original ABO system to the end. AO was already extremely rare, and because of the advent of A919, all female betas lost their fertility. As a result, Omega became the "hope of mankind" and became a fertility machine and was imprisoned in the "long-cherished wish". Alpha is physically strong and is the only race that can impregnate omegas. It is gradually promoted to a high position in the base. Because omega conception is extremely unstable, for the sake of the "hope" of the base, the research institute composed of top scientists decided to give up the uniqueness of omega's fertility so that it can breed the three characteristics of ABO, thus making conception stable.
Purpose: Group interests come first, that is, human interests come first