In the twelfth year of the Republic of China, although the Qing emperor had abdicated, the Forbidden City was still a small court of monarchs and ministers. After the folk girl Rong'er became a palace maid by mistake, she formed a relationship with the guard Li Qi, and was favored by Pu Yi because of her intelligence and liveliness. Rong'er is quite appreciated by Aunt Suki because of her understanding of cooking skills.　　Sun Yiren, the chief eunuch of the two palaces, has been stealing treasures in the palace for a long time and disregarding people's lives. After learning of this, Rong'er and Li Qi investigated the treasure theft case side by side, and finally brought Sun Yiren to justice after several life and death, but the mastermind behind the scenes is still hidden in the shadows.　　In the thirteenth year of the Republic of China, Feng Yuxiang's army expelled the Qing family from the Forbidden City. The mastermind behind the treasure theft tried to transfer and sell the treasures in the palace to foreign merchants, and the conspiracy was broken by Rong'er. Everyone joined forces to recover the national treasure, so that the treasure thief and traitor got the punishment they deserved. Rong'er, who left the Forbidden City, reopened a restaurant in Beijing, known as "the last chef".