World view setting:
Ampholens
With the ability to conceive, regardless of male or female, special marks will be produced on the lower back at birth.
Kendent
It has the ability to induce pregnancy. Regardless of male or female, special marks will be produced under the collarbone at birth.
Infertis
Inability to conceive, no matter male or female, special marks will be produced on the ribs at birth
Voidant
Incapable of causing pregnancy, no matter male or female, there will be special marks on the back shoulders at birth
Nullars
ordinary people without marks
In addition to Nullars, Ampholens, Kendent, Infertis, and Voidant will have a unique mark on their ring finger after marriage (prerequisite: both parties must have an emotional foundation for each other)
Purpose: Only by being thick-skinned can you get a wife
