More children, more blessings, starting from marrying a wife to fight for world hegemony

Lu Chen traveled to the Great Xia Dynasty and became the Ninth Prince of the Great Xia Dynasty.
Unlike the time traveler in the novel, Lu Chen neither has a wealth of knowledge in science and engineering, nor can he remember many ancient poems.
In order not to get involved in the battle for the heir apparent, Lu Chen had no choice but to lie flat, planning to live a peaceful life enjoying the prosperity and wealth.
Because of his status as a concubine, Lu Chen was finally bestowed a marriage by the emperor, and entrusted to be a prince in the bitter cold north.
Just when Lu Chen thought he was going to fall like this for the rest of his life, the system was activated on the wedding night.
As long as he gave birth to an heir, Lu Chen would be able to receive rewards and improve his own strength.
Years later.
Lu Chen brought an army of one million into King Jingqin, and everyone was stunned.
"Isn't this guy a useless prince? He has an army of millions!"
"What's the situation, he can still be a great master?"
"It turns out that the depravity of the Ninth Prince was staged!"
……

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