Potential heir to Panda Gaming Inc but Zhishu decises to pursue to become a doctor instead. Zhishu is every girl's want-to-be boyfriend in his high school days.
He has an IQ of 200 but is never interested in any of his fangirls. He lost his first kiss to Yuan Xiang Qin of the F class by accident.
In their last year of high school, he rejected Xiangqin's confession letter coldly which became an embarrassment for her. Due to circumstances, Xiangqin started living in his house.
At first, he seems to dislike the idea and the presence of Xiangqin in his house. After some time, he began to develop feelings for Xiangqin.
• Lin Yun as Yuan Xiang Qin 原湘琴
A kindhearted but not so smart girl who has a crush on Zhishu for 3 years. When she finally confessed to Zhishu, she got rejected by him coldly.
After her house got collapsed, she moved into Zhishu's house since their fathers are friends. After some time, she began to fall more deeply in love with Zhishu.
Plot:
The film opens as Jiang Zhishu is riding his bike. Yuan Xiangqin walks past Jiang Zhishu and trips on the stairs, taking along Zhishu's phone. As Jiang Zhishu tries to figure how to save Yuan Xiangqin and his phone from breaking, Xiangqin reluctantly grabs on to his tie and their lips meet, signalling their first meeting.
She then meets Jiang Zhishu again at a school assembly as he talks about his ongoing project in Boston, and finds out he's an extraordinarily smart person with a 200IQ score in the A class.
Two years later, she still is fawning over Jiang Zhishu, over his social media page. Whilst trying to get rid of the F class for bees, she sees a social media update for his account saying that he's walking back to the A building and hundreds of fans including herself start running.
As the A class gate closes, she has an ultimatum to confess to him. Later on in F class, she notices that a fire drill will start, shutting down all technology and thus allowing her to get through the A gate. She runs, finds Jiang Zhishu and confesses, to which he cold-heartedly rejects.
All students in the A grade recorded this embarrassing moment and thus make fun of Yuan Xiangqin whilst the principal scolds her for wasting Zhishu's time.
Xiangqin's house later collapses due to poor construction, combined with the previous confession, she is the centre of everyone's attention. As Jiang Zhishu walks past, Xiangqin challenges Zhishu that an F grader can get on the top 100 list for a trial exam.
He agrees. Xiangqin moves in to her father's friend's house, without knowing that it is where Jiang Zhishu resides. Over the course of time, Xiangqin and Zhishu get closer through Zhishu's mother where she encourages their relationship and encounters at school and at his house.
To save Xiangqin from embarrassment over not making the top 100, she begs Zhishu to help her study for the mock exam which he reluctantly agrees to due to her having an embarrassing video of his received by his mother.
She makes 100th tied, whilst Zhishu still remains 1st. Zhishu and his cohort then embarrasses Xiangqin at an athletics carnival as she is revealed to reside in Zhishu's house, into which she streams the embarrassing video of his at his house. Xiangqin and Zhishu then quarrel before Zhishu kisses Xiangqin on the lips before leaving.
Two years later, Xiangqin is seen to support Zhishu at Zhishu's mother's request but is left out of his life as Zhishu wants to live his own life and become a veterinary doctor.
Xiangqin follows Zhishu around to see another woman living at his apartment but finds out that she is there for business only. She is relieved and Zhishu kisses Xiangqin one more time before finding out his father becoming sick and thus takes over his business, adding stress and pressure to his life.
Caring for Xiangqin but prioritising the business, he throws away Xiangqin in order to marry another woman to combine their businesses and thus save his father's business. Xiangqin then promptly rejects his love and runs away.
Zhishu's father and mother disagree with Zhishu's decision to marry and tells him it should be from his heart whom he should marry.
Another year passes by, and we see Xiangqin looking through Zhishu's social media. Zhishu then posts an update at the school hall in which he will talk at an assembly, in which Xiangqin goes to reluctantly. She then enters the hall and sees that no one is there but him.
Zhishu then hides away and Xiangqin calls Zhishu's brother, into which he responds that only certain people can see what he posts. She then realises that the posts were meant for her. Zhishu then proposes to Xiangqin in which she agrees. A flashback occurs at the end in which Zhishu wakes up from his slumber during his time where he tutors Xiangqin and sees the love letter Xiangqin wrote for him.
At that time, the audience finds out that Zhishu was in love with her. Their marriage is seen in the post-credits scene.
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