In 16203, with the advancement of technology, humans gradually moved to different galaxies and planets in the universe.
After a long period of adaptation and evolution, humans gradually evolved the second characteristics: A, B, O
A: Made up of strong males and females, they will receive strict education from birth. They will enter a restless period within a certain period of time and emit pheromones, and need to be comforted by O.
B: 70% of all humans cannot feel or emit pheromones and are engaged in most jobs
O: It will enter estrus during a certain period and will emit pheromones, which has a strong attraction to A, which is generally female.
Concept: a sudden flash of love and hatred