The “knight of time” is a secret agent unknown to the world who protects the order of time and space. After “Agent 007” loses his life, the good-for-nothing salesperson Shangguan Nao (Du Wei Han) is selected as the next knight of time “Agent 008” and immediately thrown into the tunnel of time without even receiving his special training. His task is to eliminate the terror organization “Nine-Headed Rat” who is currently threatening the Ming painter Tang Bo Hu into creating vulgar paintings and thus altering the present, turning it into a vulgar world. Shangguan Nao, however, arrives in the Warring States period by mistake. Unable to enter the tunnel again, he has to take the train of time that stops in every time period before arriving in the Ming dynasty. On his journey, Shangguan Nao makes many mistakes that alter history. When he meets the time connector Xi Zi (Sun Yu), the two join hands as she helps him bring everything back into order again.
The story is set in Republican Shanghai. Four young people with completely different experiences in life come together to break into the underground world of “Qianmen Jianghu” and solve mysterious cases. Su Zi Quan (Ning Huan Yu) is quick-witted and calls himself the “number one master sleuth on earth”. Despite his excellent memory, he can’t recall his early childhood. His biggest weakness, however, is that he’s allergic to women. Whenever he comes into physical contact with a woman, he has to sneeze. Tang Dai Yun (Shirley Jin) is a pure and kind-hearted, but also willful rich young lady. While looking for her lost older brother, she meets Zi Quan. Joining these two is the cold butler of the Tang household Chen Yi Ming (Li Dai Kun) who has great fighting skills and is only gentle to Dai Yun, and Zi Quan’s childhood friend Lu Zi Xiao (Zhu Ya), the only woman he’s not allergic to.
The 24-year-old Zhao Xiao Xin (Liu Ya Se) loves good food and dreams of becoming an illustrator. In order to escape the dreadful city life in Beijing, she decides to stay at a guesthouse in the countryside. The owner of the guesthouse Fang Da Zhao (Zhao Cheng Yu), however, is going through a crisis as his chef left. He tricks Xiao Xin into preparing a meal and discovers that she has a talent for cooking. When Xiao Xin’s friend comes to visit her, she begs Da Zhao to pretend to be her boyfriend to cover up for a white lie. Da Zhao jumps at the chance and makes her sign a contract: He will play her boyfriend if she stays at the guesthouse as a chef.
Hao Yun (Michael Chen), a vet at a private clinic, leads a mundane life until he accidentally discovers the world is inhabited by monsters. Worried about the secret of their existence leaking, monsters capture Hao Yun and attempt to erase his memories. When their attempts fail, Hao Yun is forced to join Monsters Bureau, where he solves cases involving monsters with the help of his new partner, Wu Aiai (Wang Zi Wen). As Hao Yun dives deeper into this new world, he learns that even monsters must deal with the mundane struggles of everyday life and the entanglements created by human emotion.
Doctor Ji Xian Yun (Yang An Qi) is reborn as a princess in ancient times, but has retained her knowledge from the modern world. She relies on her medical knowledge to survive. When she meets the pregnant prince Qi Ling Xiao (Cheng Ying Hao), a sweet and funny love story ensues.
Chen Qing Qing (Sun Yi Ning), the daughter of a rich household, wants to avoid an arranged marriage and find true love. In order to find a man who loves her even if she were poor and ugly, she changes her appearance and goes to college while hiding her true identity. Her desk-mate is famous singer Si Tu Feng (Guo Jun Chen). The two quarrel all the time until love blooms.
The Day I Skipped School For You depicts the school life of the post-90s generation. It follows the naughty but handsome Chen Mo (Wu Rui Song), his desk-mate Zhao Xiao Yu (Jiang Yuan Ya Rong) and other high schoolers as they make their first experiences with love, form friendships and fight for their dreams.
An An (Wang Zi Wen) married right after graduation and got pregnant right after marriage. She is addicted to manhua and anime and never experienced working. But when her son turns five, her husband divorces her and she suddenly becomes a single mom. This is when she gets to know Xu Lang (Edward Zhang), her husband’s lawyer, who is a single dad of a five-years-old daughter. Will An An and Xu Lang have a second chance at love?
The second season continues the story of general Tang Qing Feng (Zheng Ye Cheng) and Flower Star’s soldier Ah Bu Cha Cha (An Yue Xi) as they encounter new adventures. The love between the alien and human couple disrupts the order of space and time. In order to save it, Tang Qing Feng is arrested and they go back to the Tang dynasty to find the truth. However, an accident occurs and they land in the Sui dynasty where they encounter Qing Feng’s ancestors.
Mo Lian Cheng (Xing Zhao Lin) returns to Dongyue once more, but arrives at a time when he and Qu Xiao Tan (Liang Jie) hadn’t met each other yet. He tries everything to make Xiao Tan, who doesn’t remember her future destiny, fall in love with him once again.