Due to the large number of characters appearing in the work, this directory only lists permanent characters or characters that appear more frequently. The protagonist of this work is the newly appointed health teacher, commonly known as "Teacher Hades". The educational policy is "rewards and no punishment!".

Characteristics are terrifying appearance and gentle heart. The principal of Santukawa Chitose Tsunefu Middle School, Hades's mentor, and was a health teacher at Tsunefu Middle School. The characteristic is that it never ages. Saizaki Mide is a second-grade physical education teacher at Tsunefu Middle School and a 25-year-old single beauty. Characterized by being easily excited. Juehua Therapy is a 24-year-old psychological counselor at Changfu Middle School. Her educational policy is "Spartan Education." Characterized by a poisonous tongue. Student: Tomorrow Ye Yu, a second-year student at Changfu Middle School, knew about the existence of the disease because of Teacher Hades. Characteristics are inconspicuous. Fujirosuke is a second-year student at Tsunefushi Middle School and Asuka's best friend. The characteristic is that he goes to great lengths to be lazy. Misaku Rentaro is a second-year student at Tsunefu Middle School and Asuka's best friend. Characterized by a fat body. Kabuto Shinya is a second-year student at Tsunefu Middle School and the first beautiful girl to visit the health room. Characterized by high force value. Motosaki is a second-year student at Tsunefu Middle School and the childhood sweetheart (male) of Rentaro Misaku. Characteristically, he likes beautiful works the most. Kabuto Toya is a first-year student at Tsunefu Middle School and the younger brother of Shinya Kabuto. Characteristically, he wants to be a man. Meiweilong Huang Changfu Middle School is a first-year student and a delinquent (self-proclaimed). Characterized by hating girls. A second-year student at Yasuda Kouhiro Tsunefu Middle School and a friend of Misaku Rentaro. Characterized by lack of moral integrity. Miku Hanamaki is a second-year student at Tsunefushi Middle School and has a crush on Fujirosuke. Characterized by being easily nervous. The special beauty room Yggdrasil Salon is run by two old classmates of Hades, ***, who use different methods from Hades to fight the disease.

The operator and stylist of Snake Head Special Beauty Room and World Tree Salon, an old classmate of Hades, a mature and beautiful 26-year-old woman. Characterized by stubbornness. The co-owner of Yifu Yijingyi, a special beauty salon and World Tree Salon, usually does manual labor. He is an old classmate of Hades and is 26 years old. The characteristic is straightforwardness. "Diseases" are aggregation of emotions. When the human mind has negative emotions such as confusion and worry, it is easy to be parasitized by diseases. The consciousness of the parasitized human being will be controlled by the disease, and the body will also change accordingly. Diseases usually include four types: disfigurement type, which changes the appearance of the infected person; influence type, which affects the environment around the infected person; spatial influence type, which affects everyone within a certain space; compound type, which affects the infected person and his surroundings environment.

Type of disease name: cold-blooded; confiding; ghost girl; glimpse; May fly; overprotection; burning; laziness; bad eating;

Deception; perfectionism; masculinity; Profit and loss balance influence type provocation; stealing; cowardice; loneliness; judgment; plastic surgery; soul-killing; imagination; dream; rebellion;

Lovely; sense of responsibility; destruction; neighbor love; sense of beauty; momentary space influence type Jealousy; spring drunkenness; blind advancement; General Winter compound narcissism; abstinence; escape; fate; inferiority complex; mirage; depravity; forgetfulness; self-sacrifice