Anyone who has watched palace intrigue dramas knows that the first son and the first grandson of the Emperor mean the continuation of the Heavenly Family's rule.
And why is "the first" so important? Because it always comes first.
Whether it is the Imperial Family or the common people, there will always be more joy and tolerance for this first, especially on such a joyous occasion.
So, the grand move made by the Eldest Prince, although calculating, truly pleased the dragon heart. You must know that Emperor Chu has been on the throne for nearly twenty years, having several Princes, but not a single Imperial Grandson.
The Eldest Prince has been married for two years. Emperor Chu has been waiting for good news from his mansion, even granting him a concubine to speed up the process of expanding the family line, yet he waited until now.