Fang Xiaoman, a product manager, has her proposal plagiarized by her best friend, Tang Man, only to be falsely accused and blacklisted throughout the industry. Drawing on her three years of experience as a hotline operator and her precise memory of 100,000 phone calls, she starts with a single sentence spoken by a customer, tracks down the real user to testify, and exposes her rival's forged recordings and fabricated data. Through a series of face-to-face confrontations, she systematically tears apart their lies, ultimately reclaiming her project and making an inspiring comeback from the bottom.