The real daughter Su Ci was secretly replaced by the prime minister's palace, and the maid Ayu entered the palace under her false name and became the queen. One sweeps the floor in the cold palace, and the other is favored in the phoenix position. The two have the same face, and a cinnabar mole separates the two worlds. Emperor Xiao Yan was very thoughtful, secretly verifying details such as the gesture of holding the bowl, the thin cocoon in the tiger's mouth, and the taste of tofu, and it took three months to reveal the truth.
The core of the story is not a simple battle between true and false daughters, but the joys and sorrows of twin sisters. Ayu lived a good life for Su Ci for two years and prevented her family from being destroyed, but she wanted to disfigure her face because of jealousy. Su Ci made a clear decision between kindness and hatred: to repay the kindness of being a substitute for two years with a bowl of tofu brains, and to repay the revenge of the hairpin piercing the heart by confiscating the house and destroying the family. In the end, it was revealed that the two were actually identical twin sisters - the Prime Minister's Office took away the silk and satin bundle, and the blind mother-in-law hid the coarse cloth bundle. The two sisters had been misplaced throughout their lives without knowing it.
The whole play revolves around the word "Bi": entering the palace for a substitute, preventing disasters for a substitute, living for a substitute, and dying for a substitute. The emperor's embroidered lotuses are used throughout, from the crooked lotus to the parallel stems, symbolizing the transition from misrecognition to mutual recognition, and finally the return to the true nature. Su Ci is not a holy mother, Ayu is not a facial makeup, every grudge must be settled, and every kindness must be understood. At the end, the twin sisters recognized each other in the cold palace, holding hands with the same calluses, and made peace with each other through tears. Their identities and lives were finally restored.