The Emperor and Dai Rou are brother and sister. So the Prince and the Emperor are in-laws.
The prince should be somehow related to the emperor though. For him to be a prince y'know.
He earned his place in the Palace. Trust me, they aren't related.
Is that how it is? I see now
Dai Rou and Emperor are siblings... King and Emperor are bros. King and Dai Rou are married in name but not consumated.
Um are the three of them siblings/step-siblings?? Did wang marry his (step)sister???