The basics of Omegaverse:
・Men and women are divided into a second gender known as "alpha," "beta," or "omega." Alphas, while rare, dominate society in top professions like actors and CEOs.
・Omegas, also rare, are able to give birth, whether male or female. They go into heat on a cycle and the pheromones they release during this period attract alphas. Because of this, they are usually looked down upon by society at large.

The specifics of an artist's world are always explained at the start of the story, so don't worry about missing anything!