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Eliza, who was born in poverty and was abandoned by her mother since childhood, hoped to change her destiny with her academic talent and worked hard to get into the coveted Oxford University. But surrounded by elites with distinguished family backgrounds and extraordinary talents, she began to doubt herself. In order to save money, Eliza can only live in illegal housing that is subject to demolition at any time. Through the gray bedroom window, she could often see the owner of the yellow door across the street, an old woman who lived alone who often went to the balcony to water the flowers. Her lonely figure gave her some comfort. The old woman's name is Ada, and she is the famous "rental grandma." If anyone needs a grandma present, look no further than her. She provides etiquette guidance for cross-border marriages, serves as a witness at unblessed weddings, and takes care of children for single mothers... Learning that the omnipotent "rental grandma" lives across the street, Eliza cannot resist the temptation and knocks on the yellow door, and her bleak life changes.