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To be able to divorce his wife required the clan leader to have a valid justification, because his wife was the eldest daughter of the strongest side branch, and divorcing her without reason might just cause the dissatisfied elders to change the main line.
After all, he was without a son anyway, so it was only a matter of time.
Taking advantage of the leader's dissatisfaction with his wife, the maidservant was able to quickly worm her way into his heart, and the two of them soon started scheming together on how to achieve their goals.
The leader wanted a son whose existence could ensure that he didn't lose his position, and the maidservant wanted to get rid of her lowly status and become the main wife. Both of them had a single solution - the maidservant must give birth to a male child.