The eldest princess, Xiao Changning, was poisoned and was about to die soon. Powerful officials in the court usurped the throne, and there were powerful enemies outside the country. She used her last resort to choose the seemingly most harmless useless prince-in-law as her last insurance policy. Who would have thought that the Prince Consort possesses the "Imperial Successor" training system. As long as he wants to assist Xiao Changning in stabilizing the court situation, he can get reward points and exchange them for detoxification and life-extending products and knowledge about ancient times and the present. But the system requires that she "must" personally support him to ascend the throne. Therefore, a princess who is using the system to survive, and a good-for-nothing consort who wants to be the emperor, in the tacit understanding of "one wants to live, the other wants to be big", start a game of testing each other, feeding each other, and playing tricks on all the civil and military officials.