Le Coup de Foudre is based on the author’s own story. Zhao Qiao Yi (Janice Wu) and Yan Mo (Zhang Yu Jian) are classmates in high school. One is a bad student and the other a top student. Although they don’t seem to have anything in common, they make a promise on the day before graduation to go study abroad together. But due to an unforeseen incident in Qiao Yi’s family, she can’t keep the promise and the two lose contact. Four years later, they meet again at their first class reunion. Qiao Yi finally admits her own feelings and decides to move to where Yan Mo lives in order to pursue him, but has to discover that there is already someone by his side. Yan Mo, though, secretely does a lot of things for Qiao Yi. While nobody can rival him when it comes to studying or working, he is unable to express his feelings. Will the two find together in the end?
Qiao Yi does not want to attend her high school reunion because she is afraid that her old flame, Yan Mo, would show up there. Yan Mo comes back to Nanchuan after living abroad for many years. When Qiao Yi least expects it, Yan Mo appears at the TV station where she works at as a guest and the situation could not get more awkward.
Life is tough for Qiao Yi and Guan Chao who live with a strict single mom. However, their loving stepdad always comes to their rescue when they get in trouble. Often misunderstood as someone lacking in academics, Qiao Yi works hard like everyone else, but does not like to show her effort, because she is afraid of people laughing at her.
After Qiao Yi, Wu Yi, and Da Chuan get caught stealing by the principal, they have to improve their grades in the mid-term exam in order to not get expelled. Qiao Yi and Da Chuan turn to Yan Mo for help, whereas Wu Yi gets a personal tutor. While they study hard for the exam, Qiao Yi and Yan Mo’s friendship takes another turn.
On a class trip, Yan Mo accidentally gets drunk and obeys everything Qiao Yi tells him to do. Qiao Yi asks Yan Mo out to buy him a tie, but he runs away while they are shopping. Meanwhile, Guan Chao’s love story that has been planned out ends before it could even begin.
Qiao Yi and Wu Yi have been keeping secrets from each other. They have a huge fight when Qiao Yi finds out that Wu Yi has been lying to her face and dating Big Bear in secret. On the other hand, Wu Yi has no idea why Qiao Yi keeps a distance between them. Mr. Gao asks both of them to write a list of each other's strengths and weaknesses as a solution.
Qiao Yi and Wu Yi are busy preparing cards for the New Year. Meanwhile, Yan Mo's mom tries to find out about the person who buys a T-shirt for her son. At the same time, Yan Mo is worried that Qiao Yi is mad at him and tries a few ways to coax her. The Parent Meeting has been held and the parents receive their children's scores and ranking for the whole semester.
Yan Mo waits all day for Qiao Yi to come to his house as promised, but she does not show up. To make it worst, Yan Mo senses something suspicious with his dad when he returns home. Qiao Yi and Guan Chao’s estranged dad returns to make peace, but is not welcomed by his children. Qiao Yi helps to tail Yan Mo’s dad and finds something shocking.
Qiao Yi invites Yan Mo to her house, so he comes bearing a gift to meet her parents, but it turns out to be a birthday party for Qiao Yi’s dad. Guan Chao agrees to meet his estranged dad and refuses his offer to make peace. When Qiao Yi reveals to Yan Mo what she had seen when tailing his dad, Yan Mo is left with no choice but to confront his parents and hear the painful truth.
Qiao Yi is falling behind in her grades and this makes her parents worried. They try to console her, but with Yan Mo’s misunderstanding of her, she feels even more pressured. When Da Chuan explains to Yan Mo what Qiao Yi is going through, he offers to help. Meanwhile, Wu Yi helps Guan Chao get into the basketball team while thinking that he is doing it for extra points in the exam.
Qiao Yi and the gang make a trip to Beijing. She finds out about Yan Mo’s plan to study in England and meets Yan Mo’s mom for the first time. When Yan Mo tells her that he does not want to study in England anymore, Qiao Yi promises to work hard to study abroad with him. Guan Chao gives Wu Yi an opportunity to confess to him, but ends up being the one taking the initiative.
Mr. Gao calls the students one by one to see him at the office. He asks them about their dreams while reminiscing about his own dream when he was younger. At the same time, Qiao Yi reveals her intention to study at England to her family.
Wang Yu Ran has just moved to the school and has become the talk of everyone. Sun Zhen Qi approaches Wang Yu Ran and later gets rejected and humiliated. He finally takes revenge on Wang Yu Ran after he finds out her true identity. Qiao Yi is struggling with herself whether to help Wang Yu Ran or just keep quiet.
Yan Mo is admitted to the hospital due to some illness after eating unhealthy food. While Qiao Yi is waiting at the hospital, she sees her dad being taken into the Emergency Room. She starts to avoid Yan Mo and tries so hard to hide the truth of what has happened to her family. Yan Mo can sense that she is hiding something from him and it drives him crazy.
Yan Mo has gone to England while Qiao Yi goes to a local college near her house. She has changed and become a new person, unlike when she was in school. Qiao Yi is offered a scholarship and a chance to study in England for a week. She hesitates whether to accept the offer or not.
Qiao Yi decides to visit Cambridge and unknowingly stays at Yan Mo’s house. Yan Mo who likes to avoid strangers is not aware that the visitor at his house is actually Qiao Yi. Fast forward to six years later, she meets Yan Mo at the TV station where she works at, and when she cannot tell him why she turned him down years ago, he storms off from the set causing the shoot to be canceled. Now, Qiao Yi has to persuade Yan Mo to return to the station in order to keep her job.
Qiao Yi shows up drunk at Yan Mo’s bedroom and has to be carried home by Guan Chao. Yan Mo returns to the station and does the interview as planned. Wu Yi and her mom continue to disagree on what’s best for her future. Da Chuan set up Qiao Yi and Yan Mo so they would talk things out, but Yan Mo cannot look past Qiao Yi’s broken promise and walks away.
After quitting her dream job, Qiao Yi lands in Beijing where Yan Mo and Da Chuan are, but Yan Mo continues to avoid her. Wu Yi and Guan Chao have too much to drink and end up in an awkward situation for the both of them. Da Chuan offers Qiao Yi to come to work at their start-up company.
Qiao Yi attends the interview at Yan Mo's start-up company. Meanwhile, Hao Wu Yi has been avoiding Guan Chao after sleeping together because she is shy. At the same time, Guan Chao bumps into his ex-girlfriend at the hospital and she invites him to her wedding.
After Qiao Yi accepts the job as an intern at Panda Technology, she is assigned to work under You Mei who likes to bully her. On the other hand, Hao Wu Yi is facing challenges when her editor locks her online novel without any explanation. Qiao Yi's parents start to subscribe to the Beijing newspaper and religiously watching the weather forecast in Beijing as they are worried about their children.
Qiao Yi argues with her mom over the pickles her mom sent to her. Meanwhile, Yan Mo secretly finds two tickets to Jay Chou's tour for Qiao Yi as she is a huge fan of Jay Chou. Hao Wu Yi breaks unexpected news to Qiao Yi and it pisses her off.
Guan Chao suspects that Qiao Yi is pregnant and takes Yan Mo along to confront her. Hao Wu Yi decides to have the baby abroad and later finds out that her mom has also decided to emigrate. Guan Chao is still baffled as to why Wu Yi seems like she is avoiding him.
Guan Chao unexpectedly finds Hao Wu Yi and demands an explanation. Yan Mo and Qiao Yi try to persuade Professor Li to work for them but to no avail. Before Panda Technology could launch their wristband, Hexin Group steals their ideas and advertises the product ahead of them. Yan Mo quickly finds solution to save his product and company.
When Wu Yi finds out that her pregnancy is a false alarm, she cannot bring herself to tell Guan Chao the truth considering how serious he is about taking responsibility. As the mission to rescue Panda’s product seems more and more hopeless, Guan Chao challenges Cheng Ye to a one-on-one battle.
Qiao Yi moves into Yan Mo’s place after she is kicked out of the house. She confesses her feelings to Yan Mo and he officially declares they are in a relationship. Guan Chao and Wu Yi shop for baby products. Meanwhile, Panda Technology is making progress in their promotion.
Wu Yi finally has the guts to tell Guan Chao the truth about her not being pregnant. Da Chuan keeps on pursuing You Mei by doing a lot of things. At the same time, Zhou Zhao is showing interest in Wu Yi.