Si Yu is transmigrated into a peasant girl and sold as a maid at age three. Wanting only to survive, she is fortunately adopted by Mammy Zhao as an adopted daughter. Later, she follows the Mistress into the Yu family, gains the favor of the Old Mistress, and is sent to the eldest household to care for the sickly Eldest Master, helping him recover and bear a son. After Mammy Zhao marries the Sixth Master, Si Yu officially becomes the Sixth Young Miss of the Yu family, named Yu Yu, and is meticulously raised by the eldest household. She accompanies the Eldest Uncle to the capital, gets entangled in palace intrigue, and reunites with her biological elder sister, Si Shi, who is a noble concubine. Her philosophy is simply to stay alive. How to be a good maid is what matters most. After all, if one cannot survive, where will blessings laced with arsenic come from in the future? The men around the protagonist are all mere passersby in her life.