When the piano music flowing from the fingertips collides with the rigorous and meticulous formulas, when the stage-anxious piano girl meets the rationality-oriented math major, a misplaced first encounter quietly intertwines two completely different worlds.
Lin You, a sophomore girl in the music performance department, has a sincere love for the piano, but is trapped in the shadow of the past competition arena and is timid to stand on the stage under the spotlight. Jiang Chen, a junior student in the Department of Mathematics, is immersed in the world of numbers and theorems. He believes that logic can deconstruct everything, but he cannot understand the panic and starlight in the girl's eyes. An unexpected collision backstage knocked over his precise model and disrupted each other's heartbeats. In order to deal with their respective troubles, a contract of "pretending to be a couple" came into being. It was originally a cooperation where each got what they needed, but during side-by-side study in the library, tacit rehearsals at the music festival, and looking at each other on the rooftop in the first snow, they quietly deviated from the preset trajectory.
The lively best friend Su Qingshen keeps assisting, the harmful friend Chen Xu madly makes trouble and makes complaints, the gentle senior Lu Xingyuan stirs up ambiguous waves, and the enlightened Jiang Mu reveals the youth's concerns with one word. When rationality meets sensibility, when formula meets the keys of the piano, the heartbeat that began with the contract will eventually compose a romantic prelude that is unique to them.
In the stumbling growth, Lin You broke away from the shackles of anxiety and found her shining self; Jiang Chen broke through the barriers of logic and learned to embrace the uncontrollability of the world. It turns out that the best love is when you show your courage for me and I show my sincerity for you.