On the first day of school, Fang Qichen, who suffers from severe germophobia, arrives at his dormitory accompanied by his mother. He immediately designates a 'clean zone' and sprays everything with disinfectant. His strict hygiene rules lead to constant clashes with his roommates, who mockingly nickname him the 'Disinfection Young Master' and eventually ostracize him. When his mother suddenly develops appendicitis and is hospitalized, Qichen, who has always been meticulously looked after, is forced to face the everyday challenges of living independently. He also takes a part-time job cleaning the teaching buildings to support his studies. Through the ups and downs of communal life, he gradually lets go of his obsessive cleanliness, learns to respect other people's boundaries, and ultimately reconciles with his roommates, completing his transformation and growth through collective living.