Qi Xuan (Ai Siqi): A flower in a certain dormitory of a certain medical university. She has a little evil heart and likes to bully her friend Fang Tangtang, who is in the same dormitory. However, the relationship between the two is extremely strong and they care about each other very much. Hobbies: She likes extremely handsome men and is a rotten girl.
Qi Yu (Fang Tangtang): He is Ai Siqi's roommate and the dormitory manager. Before time travel, he was average-looking, but he studied exceptionally well and won scholarships many times. He is often bullied by Ai Siqi and is kind-hearted. However, he is a bit sinister due to being tortured by his friends. Hobbies: Extremely handsome men, extremely nymphomaniacs.
Qin Tianzhe (Liu Yu): Ai Siqi's roommate. He and Hu Han'er are good friends, and they are good friends like enemies. He has a good relationship with the three people in the dormitory. This person has profound foundation in humanities and history, and has a strong interest in ancient Chinese culture. Hobbies: Reading, Chinese studies, and liking stunning beauties.
Qin Siyu (Hu Haner): He is also Ai Siqi's roommate. He is generous, kind-hearted, introverted and quiet, and his thoughts are quite traditional. He and Liu Yu are good friends. Hobbies: Wide range of hobbies. I like talented, mature and handsome guys.
These four people are roommates and friends, and they traveled through time in a joke. Let's see how the four of them play with the world and the court, and slowly grow up through twists and turns in their ups and downs. Finally found his lover and lived happily together.