Lin You wakes up transmigrated into the body of a cannon-fodder supporting character in a novel, destined to oppose the female lead and meet a tragic end. She finds herself employed as a lifestyle assistant in a specialized villa housing four young masters from top chaebol families, each suffering from severe psychological or physical conditions. Su Jin suffers from anorexia and mysophobia, Shen Mo battles somnambulism and alcoholism, Lu Chen is intensely averse to female contact, and Ji Lin struggles with depression and mood swings. Lin You is bound by an exorbitant breach-of-contract penalty, forcing her to endure the hostile environment while trying to survive without interfering in the main romantic plot.
The story begins with Lin You being coerced by the senior assistant Fang An'an to deliver a meal to the anorexic Su Jin, a task that has caused previous assistants to quit in trauma. Despite her hesitation, Housekeeper Zhou orders her to comply. Upon entering Su Jin's dark room, she is nearly attacked but manages to feed him by physically restraining him on the bed, a bold move that shocks the young master but ensures he eats. Simultaneously, Jiang Zhirou, the novel's female lead, takes on the care of the sleepwalking Shen Mo, though Lin You ends up assisting him after he wanders during a drunken episode. Lin You guides the sleepwalking Shen Mo back to bed and stays awake to guard him, an act of diligence that Shen Mo subconsciously remembers despite his amnesia regarding the night's events.
As Lin You settles into her role, she encounters friction with Fang An'an and Wang Xiao Lin, who view her as a threat to their positions. Jiang Zhirou, initially appearing gentle and protective, begins to feel threatened by Lin You's competence and the unexpected attention she receives from the young masters. Shen Mo, recalling the comforting presence of the woman who cared for him, insists that Lin You prepare and serve his breakfast personally, bypassing Jiang Zhirou's carefully curated service routine. This decision marks a shift in the narrative, as the male leads begin to form independent attachments to the new assistant rather than solely relying on the female lead.
Lin You's professional demeanor and lack of fear unsettle Ji Lin, who tests her boundaries by pinning her to his bed. Unlike previous assistants who panicked or showed pity, Lin You remains calm, tidies his room, and treats him with detached professionalism. This indifference intrigues Ji Lin, who claims her for his personal service. The core conflict intensifies as Jiang Zhirou's facade cracks; she realizes that Lin You's presence disrupts the original plot dynamics. While Jiang Zhirou attempts to maintain her role as the indispensable caretaker, Lin You's practical approach and willingness to perform undesirable tasks earn her the grudging respect of Housekeeper Zhou and the curiosity of the young masters. The narrative establishes a tension between the prescribed romantic storyline and Lin You's pragmatic survival strategy, setting the stage for her to alter the fates of the four young masters through her unique interactions.
