Fired for insisting on extreme hygiene standards, top quality control expert Yan Jing turns around to take over a filthy, chaotic grassroots inn. Facing housekeeper Wang Jie's deeply ingrained perfunctory habits and former boss Gao Dong's malicious sabotage, he decides to thoroughly transform the dirtiest guest rooms using medical-grade disinfection standards and hardcore testing instruments. This dimensionality-reduction strike of a hardcore deep clean is not only a steadfast defense of the bottom line of hygiene, but will also reveal whether he can lead grassroots employees to reclaim their professional dignity and achieve a perfect counterattack for the inn.