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Every descendant of an ancient Profound Martial family must know the importance of discretion in their actions.
Especially before marriage, it is crucial to maintain a good reputation and decorum. Otherwise, it could significantly tarnish their marriage prospects—in the worst cases, the betrothal can be downgraded.
No Profound Martial family would betroth their daughter to a notorious scion. Especially for legitimate sons and daughters, attention to these details is paramount as it deals with the honor and reputation of two noble families.
Therefore, from childhood onwards, legitimate sons are tended to by servants rather than a coterie of maidservants.
An incident like taking a concubine before marriage is almost impossible. Every noble family has its pride, how can they allow their legitimate daughter to marry a man who already has a concubine?