Madam Tan, the principal wife of a wealthy merchant,feels the intense pressure to bear a male heir for the Tan clan. Otherwise, her status in the Tan household will be severely undermined by a concubine and her son. When she gives birth to a daughter, she orders her personal maid to bring back a baby boy to switch with her daughter and raise as her own. Her biological daughter gets adopted by a impoverished tea farmer and is named Ru Yi. To her dismay, Madam Tan's surrogate son falls in love with this "lowly tea girl," Ru Yi.