Responses
I believe the older brothers are sons of concubines instead of Empress, that's why they're not CP. CP is CP because he is the eldest son of the Empress.
The cp must be the son of the empress or at least a very high ranking concubine with a powerful family so not by order but by ranking
The empire must have an empress before start taking concubines
CP's mother is dead, so she would've been a noble Consort or an Empress before she died
there is an eldest brother and 2nd brother, how about the CP? arent CP's supposed to be the eldest? （/TДT)/
also how horny is the emperor?? he fucks nonstop?18 kids? There is a 13th prince then the MC (18th) from the same mother, so there are like five other kids in between them from different women?