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The Emperor could remove Liu Gong from power at any time for the reason of "not surnamed Zhu."
This was tantamount to the Han King's Mansion handing over the root of their power to the Emperor, yet they still controlled the Thirteen Cities of the Northern Ring, which remained one of the foundations of The Royal Family. Once Zhu Qianyun managed the Demon Management Bureau well, the Emperor could naturally pass the identity of the King of Han to Zhu Qianyun while completely eradicating Zhu Qianyun's identity as Jianwen's Heir.
With this move, the situation shifted from a winner-takes-all to a win-win.
No, actually...
It was a triple win.
Looking at the Jade Gourd Bracelet on Tang Wan's wrist, sparkling with a gentle luster, surprise appeared in Liu Gong's eyes.