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This is some information about the story: the universe, race, etc.

The species :

1. Yin and Yang are entities and beliefs for some tribes.

2. Alpha is the Yang's breed; they are superior species rather than ordinary humans.

3. Omega is the Yin's breed; they are not superior to an Alpha, but their abilities are necessary. They play an important role in maintaining their species, reproducing, and balancing their tribe/clan.

4. Beta is a common species, the name is not usually used, but in a tribe/clan, they are typically called the common species as Beta.

The habitual :

1. A powerful Yang breed usually makes a clan, and the clan will assemble in one place owned by the most powerful Yang breed and form a new tribe.

2. Heat/Rut is a biological period that has to fulfil and take an important role in part of reproduction.

3. Fated mate/partner is a circumstance where Alpha and Omega have the strongest interest in each other and usually have some symptoms like; getting interested in just only one scent of pheromone and thinking the pheromone has a flavoured smell, feeling hypnotized, and having to obey the strongest pheromone (especially Omega against Alpha).

4. Knot/knotting is the way Omega could get pregnant; Omega could not get pregnant if their Alpha were not knotting them; this is the special one about Omega, which is Female could easily get pregnant than Omega, meanwhile, to makes Omega pregnant the Alpha has to knot them precisely.

The universe :

The countries' names are still the same, and where the main characters and the related ones live in the place placed between the oriental and occident which is they have an island and country themselves. So I added a new country and some islands to it.