Summer 1996. While chasing after a bicycle thief, Yang Xi (Wan Peng) hurts her leg and therefore can’t participate in the long-distance run to earn some bonus points for the college entrance exam anymore. When school starts again, Yang Xi not only has to discover that the offender is her new classmate Hua Biao (Hou Ming Hao), but he even snatches away her position as class monitor. The entire class considers the hot-blooded and impulsive newcomer Hua Biao who is gifted in sciences as their enemy. Hua Biao, however, proves them wrong as he continuously helps his classmates out. In the end, he becomes part of the “Five Flying Bicycles Group” and Yang Xi learns that he’s not only responsible and loyal, but also very respectful towards his grandma. Yang Xi finally lets go of her prejudices and the little group experiences their last year of high school together.
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.
Legend says that once in thousands of years, the door to the Realm of Gods opens and the child of the King of Hell is born on earth. Evernight follows and the peaceful earth is thrown into turmoil. In the 15th year of the Tang dynasty, woodcutter Ning Que (Chen Fei Yu) takes his maid Sang Sang (Song Yi Ren) with him and enters the capital. He manages to pass the exam for the most reputable academy and becomes the discipline of the academy’s leader. When Sang Sang suddenly suffers from a mysterious disease, Ning Que finds out that she’s related to the evernight. In the blink of an eye, Sang Sang becomes the target of all humans. Ning Que and Sang Sang then start roaming the world in order to protect Sang Sang.
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.
As Si Tu Mo (Xing Fei)’s graduation is nearing, she is confused about her future plans. She tries out all sorts of things all the time and is unable to make her own decisions. Her ordinary days are suddenly shaken up when the genius Physics student Gu Wei Yi (Lin Yi) appears in her life. The two accidentally end up living together and chaos begins.
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.
Two years have passed since white collar worker Jiang Yi Yi (Ivy Chen) and her first love Chu Tian Qi (Archie Kao) broke up. Even though Yi Yi pretends to not be affected anymore, she still can’t forget him. Then she meets the trainee guardian Fang Mu Ye (Wang Zi Qi) from the Guardian Tribe, with whom she ends up living together. Mu Ye’s supernatural powers add a lot of fun to Yi Yi’s life, making her gradually forget Tian Qi and focus on her dream of becoming an inventor again. The two become a bickering couple, however, a crazy scientist, who’s looking for a study object, appears.
Did she bite off more than she can chew? Bai Xin Xin (Cai Wen Jing) is a first-year medical intern who crosses paths with Shen Yi Zhen (Zhang Yi Shan), a man from a wealthy family. When Xin Xin is roped into becoming the personal attending physician for Yi Zhen, she doesn’t understand what she signed up for until it’s too late. As Yi Zhen’s seven different personalities begin to emerge, so too do dark secrets from his cruel family history. Can Xin Xin help the many faces of Yi Zhen recover from his painful past?
The two friends Zhang Ruo Chen (Zhao Zhi Wei) and Cheng Zhe Hai (Xu Yang) have a common dream: They want to become part of the national swimming team. In the national swimming championship they end up competing against each other. During the 200 Freestyle, however, Zhe Hai suddenly falls back and thus has no chance of standing on the awards platform anymore. Moreover, he disappears without any word after the match. Ruo Chen is angry for he believes that Zhe Hai let him win on purpose. Two years later, the two former friends unexpectedly meet again at the same sports school, but Ruo Chen is very cold while Zhe Hai seems to have lost any interest in swimming.
In 2010, Cheuk Hoi secretly travels to Bangkok to conduct a drug operation with his undercover agents in Thailand. As they finish their mission and are about to leave Thailand, an explosion causes all of Michael’s undercover agents to die in a sea of fire. At the same time, Michael’s good friend, CIB Inspector Eddie Cheung, is killed for unknown reasons, leaving Michael in charge of a female cop who is not yet officially an undercover. Michael knows that Eddie still has undercover agents whose identities have been deleted. To learn the truth about Eddie’s death, Michael must find all of the undercovers. He and Priscilla begin to search for the undercover agents.