After traveling through time and becoming Prince Bai Yueguang's stand-in, Shen Weiyang just wants to survive in construction and silently promote fertilizers and Pinyin. Until she discovered that Mr. Huaijin, who was deeply trusted by the prince and had every plan, looked exactly like his "late" sister. The moment Bai Yueguang and the substitute looked at each other, they hid their secrets in a tacit understanding. Later, the prince wanted to send her to marry him for power and promised Mr. Huaijin the throne. At the palace banquet, Shen Weiyang put down the wine and Mr. Huaijin tore off his disguise mask. They smiled at each other and decided to join forces to create an obedient emperor and a new world without him.
