When a cold wave strikes, a batch of low-priced down jackets boasting "90% down" suddenly explodes in popularity, but behind it hides a shady scheme of replacing real down with cheap flying silk. Adults catch colds, run fevers, and get hospitalized; children suffer from respiratory discomfort and whole-body rashes due to shoddy fillings. Even more terrifyingly, to protect themselves, the unscrupulous merchants splash all the dirt onto the owner of an old factory who insists on genuine materials and honest work. Facing abuse, public accusation, and cyberbullying, he refuses to bow his head. Step by step, he searches for evidence, exposes the lies hidden inside the down jackets, and guards the most important thing in business—a clear conscience.