A young girl named Mùi finds herself in the role of a servant for a family in pre-unification Saigon (1951), which, despite its former wealth, is now slipping into genteel poverty, largely due to the husband's reckless spending and unfaithfulness. The family's financial stability hinges on the wife's modest fabric and textile shop. The husband’s widowed mother, an invalid who rarely leaves her upstairs room, constantly blames her daughter-in-law, insisting, > "You have a man, but you don't know how to keep him happy." The family dynamics are strained: the eldest son prefers the company of friends, the bookish middle son finds amusement in tormenting insects, and the youngest son idolizes his father while displaying willful and disruptive behavior, often filled with resentment. In contrast, Mùi is a figure of peace and deep curiosity about the world around her. The wife, who once lost a young daughter during one of her husband’s frequent absences, shows kindness to Mùi, treating her as if she were her own child.
When the husband embarks on his fourth and ultimately final disappearance, he absconds with his wife's scant savings and jewelry. His absence stretches long enough that the family faces severe hunger and deprivation. Upon his return, he brings back some of the stolen jewelry, but soon collapses after arriving home. In a desperate bid to prepare for his medical needs, the wife sells an heirloom vase and other cherished items, prompting a doctor to be called. While Mùi witnesses the doctor treating her husband with acupuncture, friendly musicians play cheerful tunes outside the room. Yet, when he passes away, the wife faints, leaving the family in shock and despair.
Fast forward ten years, the family has continued to deteriorate; two of the sons have left, and the wife has taken on the role of the grandmother, now tragic and rarely seen. On the family shrine, the photographs of the grandmother and the husband now share space with others who have departed. It's deemed that the family can no longer afford Mùi’s services. With a heavy heart, the wife gifts Mùi a silk dress and some gold jewelry before she moves on to work for the wealthy friend of her eldest son, who has become a concert pianist engaged to be married. However, he appears to be more enamored with his piano than with his lavish fiancée.
One fateful night, while the fiancée babbles on, the pianist’s playing takes on a stormy intensity as he tries to ignore her. After she leaves, intending to spy through the window, she witnesses something extraordinary: when Mùi enters the room, the pianist’s music transforms into a blend of passion and tranquility. Later that night, he discreetly visits Mùi in her quarters and shuts the door behind him. When the fiancée discovers this, filled with rage, she slaps Mùi, damages some of the pianist's belongings, and leaves her engagement ring on a table. Upon returning, he nonchalantly picks up the ring, and their secret connection grows deeper as he begins teaching Mùi how to read and write. In the poignant final scene, a visibly pregnant Mùi is seen reading poetry to him, her face adorned with a radiant smile.
