At the age of seventeen, filled with chalk dust, Lin Wanxing was curled up in the burning pain of "28 points", but he saw Jiang Chen, the top grader, coughing blood on a tissue - that frost-like boy, with his straight back hiding a deeper embarrassment.
He was as silent as a shadow, throwing down his pen for her to resist the humiliation of "holding back", and covering the ice chair with warm school uniforms; she clumsily approached, tears fell on the back of her hands when she couldn't carry him who fainted, and she tightened her stomach medicine bag when he was scolded for "killing his father's life". When her critically ill mother's pencil broke, she rushed into the ward holding his wallet: "The family is here!" Shattering his "orphan" pretense.
Two-way throbbing fermented in orange blossom aroma. He caught a fever and sniffed the temperature of her contaminated school uniform. He held her wrist tightly under the guise of adjusting the equipment in physics class, and the sudden heart rate curve revealed the secret; she misheard "Are you afraid of the cold" and cried in the stairwell, and he used chalk to write pinyin to verify it. Reunited on a snowy night, she offered an apple core, and he unfolded the wallet fragments: "The definition domain lacks an upper limit." She pointed at the fragments with a finger covered with a band-aid: "The value domain allows {Lin Wanxing}∈Jiang Chenji?"
From the secret change of warm water to the "drop-in" delivery of medicine across the city, from the sweat-soaked draft of the "root number house" to the eternal "28 heart points" on the wedding invitation, the most painful equation of youth can only be solved by each other. When absolute zero is disintegrated by the kiss of eyelashes, the unnamed midsummer heartbeat finally converges towards the definition of eternity.
Concept: In a youth as harsh as a function, two scarred souls use clumsy mathematical language to assign values to each other's pain, ultimately proving that - "The sum of love and inferiority is always equal to salvation." When the world attempts to use scores to define good and bad, and use rumors to mark fate, they use each other as the coordinate system, proving that the sharpest youth pain will eventually be replaced by gentleness into a solution with super-saturated sugar content - because love is the only recursive algorithm that can rewrite the initial conditions of life.