As the cat of the richest family, I am so happy.

Qilan is a young woman who has endured a life of hardship since losing her last family member at eighteen. She supported herself through school with financial aid and part-time jobs, eventually becoming a management trainee for the R·S Hotel Group. Despite her hard work, she remains burdened by student loans and medical debts. After being promoted to head waiter, she attempted to expose the food and beverage director for harassing a subordinate, but the victim retracted her statement out of fear of losing her job. Qilan was instead accused of making false accusations, leading to her isolation and ostracization by colleagues. While working at the Zana International Hotel, she is assigned as the private butler to Liang Jianshi, the chairman of Lanxing Real Estate Group and the hotel's major owner. Liang Jianshi is a reclusive billionaire known for his cold demeanor. During their first meeting, he ignores her completely, leading Qilan to believe he is rude and dismissive.

Qilan's situation worsens when Lin Anyuan, a wealthy socialite with a history of hostility toward Qilan, touches Liang Jianshi's prized piano. Liang Jianshi, furious about the incident, mistakenly blames Qilan and fires her on the spot. Humiliated and desperate to clear her name, Qilan chases after Liang Jianshi's car in the rain. She collapses from low blood sugar and hunger, only to awaken as a tiny white kitten. Lost and vulnerable, she encounters Liang Jianshi again. Initially, she tries to manipulate him for food, but he unexpectedly shows her kindness, taking her to a veterinarian and naming her Lanlan. Qilan is forced to navigate her new existence as a cat while living in Liang Jianshi's luxurious presidential suite.

As Lanlan, Qilan experiences a stark contrast to her human life. Liang Jianshi, who was cold and indifferent to her as a human employee, becomes attentive and caring toward the kitten. He feeds her, plays with her, and even allows her to sleep in his bed. Qilan struggles with her dual identity, hiding her human consciousness while enjoying the comfort and security she never had before. Meanwhile, her human body is found unconscious and hospitalized. Her colleague Tong Tong helps her recover in the staff dormitory. Qilan learns that the hotel management had unfairly scapegoated her, but Liang Jianshi intervenes, ensuring she is rehired and that those responsible are disciplined.

The narrative explores the complex dynamics between Qilan and Liang Jianshi as they interact in both human and feline forms. Qilan discovers that Liang Jianshi had been undergoing medical treatment that affected his vision and hearing, explaining his initial indifference. He leaves her a note apologizing for the misunderstanding, which softens her resentment. However, Qilan must also contend with threats from Lin Anyuan and Hu Lu, a hostile hotel employee who attempts to kidnap Lanlan. Liang Jianshi protects the cat fiercely, revealing his deep attachment to her. The story follows Qilan's adaptation to her new life, her growing bond with Liang Jianshi, and her efforts to uncover the truth behind her firing while maintaining her secret identity as a cat.

Qilan's journey involves balancing her professional responsibilities with her secret life as Lanlan. She uses her feline form to gather information and navigate social situations that are inaccessible to her as a fired employee. The relationship between Qilan and Liang Jianshi evolves from one of misunderstanding and resentment to mutual care and understanding. Liang Jianshi's protective nature toward Lanlan contrasts with his distant behavior toward Qilan, creating dramatic irony and tension. As Qilan adjusts to her new reality, she must decide how to reconcile her human ambitions with her unexpected life as a beloved pet, all while dealing with the lingering threats from her past and the complexities of her relationship with the enigmatic billionaire.