Cheng Xi, who shared an apartment for a year and unselfishly shouldered public sanitation duties for a long time, was instead met with suspicion and harassment from her roommates. After completely awakening, she drew clear interpersonal boundaries, deeply cultivated professional cleaning skills, and fought her way up through meticulous craftsmanship and a reliable reputation, growing from taking odd jobs to a senior cleaning supervisor at a company. The calculating roommates reaped what they sowed, and fair, orderly rules of coexistence were finally rebuilt in the shared apartment. The story conveys a positive core of establishing oneself through professionalism and steadily advancing, demonstrating the power of an ordinary person achieving dual growth in life and career through personal effort.