Jia Li: Male, a student in the second grade of junior high school (1), upright, strong and independent. He is smart, witty, passionate and righteous, but sometimes he comes up with strange tricks that are self-defeating. He also likes to throw stinky socks and play pranks. When I peeked into my sister's diary, I was often worried about having a younger sister. I was dismissive of my younger sister and liked to tease her. Together with Chen Yingda, he is considered by girls to be the coolest boy in the second grade of junior high school. Lots of ideas and strong opinions. Famous quote: Only boys are miserable in the world, and those who have never been a boy don’t know.

Lu Zhisheng: Male, with a fat head and fat brain, loves to be clever, reckless, likes to show off and make a fuss. Girls are popular and like to brag. He is funny, has a sense of justice, has a strong sense of community, is loyal and honest to his friends, but is a lazy Madaha-like character in his studies. A happy boy who is both rough and fine, honest and frank, and naturally optimistic. Zhang Xiaosha nicknamed him Big Food Bag

Chen Yingda: Male, a genius who studies every second. He sticks to mathematics, physics and chemistry and solves problems until midnight. Thin and tall type, timid, sensitive, and easily excited. There are many inventions, such as the "electric earthworm" patent application

Zhang Xiaosa: Male, tall, 1.75 meters tall in the second grade of junior high school. He likes to stroke his mustache. My father opened a bakery. He is chic in every aspect, can talk about astronomy, geography and stocks, is a bit fake, and is loyal to his teacher. Broad shoulders, tall nose, hair parted in the middle, brand-name clothes, and riding a brand-name moped. He went toe-to-toe with Jari, but was defeated several times.

Wang Xiaoming: Female, originally from Class 2. Her composition was too short and poor, like sending a telegram. When I was transferred to Class 1, I wrote letters to Jia Li every now and then, and finally wrote "Please do not spread the word." She admires Jia Li and thinks that Jia Li is a hero in her mind. She smiles at Jia Li three times a day. Unfortunately, Jia Li looked down upon her and thought she was too gaudy. She is particularly talkative and enthusiastic towards Jia Li. Due to her special cross-class experience, she is very efficient in delivering messages between Class 1 and Class 2.

Zhang Feifei: Female, a fierce girl like Wang Xifeng, and half-brother and sister of Zhang Xiaosha. He has an outstanding appearance and a tall figure. He is a sophisticated man. Jealous of Zhuang Jing.

Zhuang Jing: Female, a girl like poetry. She has the gentle temperament and delicate face of ancient beauties. She likes to wear light-colored dresses and loves cleanliness. His excellent grades are on par with Chen Yingda's. Mathematics teacher Yan Pingping commented that his "right brain is particularly sophisticated." I like calligraphy and poetry, love books as much as my life, and my writing style is beautiful. He is friendly to others, never speaks ill of anyone, and attracts the attention of the boys in the class. Jia Li admired her very much.

Liu Geshi: Male, dull, pedantic, accepting death, but very upright, dare to compete with Zebra, a ruffian in the same grade; he stutters and refuses to admit it, and often makes fun of his classmates. I have a father who is a theater manager. He is not good with girls, but some girls trust him in their hearts, even if they don't talk to him much. Zhang Xiaosa laughed at him because he was so stubborn that he lived an unhappy life.

Teacher Cha: Male, head teacher of Class 1, young Chinese teacher, with 1 year of teaching experience. The online novel he wrote attracted the attention of the TV station, and he was seconded by the TV station for two months to rewrite the novel into a sitcom. Calm, kind, good-minded, innovative and insightful, he is Jia Li's idol. The sarcastic remarks about classmates who do little things in class are also well-spoken and convincing. Mantra: A calm mind sharpens a knife.

Jia Mei: Female, Jia Li’s twin sister. Innocent and lively, kind-hearted and compassionate. Generous, understanding, fragile, lazy, gullible. He is mediocre in talent and full of squeamishness. He likes to tell small things, but he always only tells good things. She likes fortune telling and zodiac signs, and says that Jia Li is her nemesis. Being pampered by his parents at home has always made Jia Li worried.

Dad Jia: 40 years old, strict, old-fashioned, and sometimes quite funny. I want to be a writer, and I really hope to be transferred to work in a television station, and I will work hard for it. He calls his son "Your Excellency" every day, is sarcastic, and is very harsh on his son, but he loves Jia Mei in every possible way.

Mama Jia: Actor in the troupe. Treat Jia Li and Jia Mei as children who will not grow up.

Lin Ping: Jia Li met in the hospital, a Lin Daiyu-like figure, but more lively than Lin Daiyu.