The seven princes have the same father and mother. It may be assumed that the queen dies young and her successors are wise and regard them as their own children. They grew up together and have a deep relationship that is far beyond that of ordinary royal brothers.
It seems calm inside and outside the court, but in fact there are undercurrents (foreign races, powerful ministers, and Jianghu forces).
The seven brothers each have their own strengths, complement each other, and face the storm together.