Su Yan, the top student at Qiming High School, is a "glacier" in the eyes of others: aloof and proud. He dominates physics competitions and has ranked at the top of his class for years, yet his childhood spent living with foster families left him sensitive and starved for affection. He has learned to hide behind his achievements. Then Jiang Chi, a headstrong transfer student, barges into his world, and everything begins to change.
Jiang Chi was once the runner-up in the national boxing championship. After accidentally injuring someone while defending a friend, he left the team and transferred schools with the label of a "troublemaker," concealing a tender heart that fiercely protects those he cares about. His fighting skills are off the charts: he can shield Su Yan from bullies and demand justice for him in competitions. He also awkwardly brings him hot sandwiches and stays up all night organizing his mistakes, warming that glacier in his own way.
From a tutoring arrangement neither of them wanted to the unspoken tension of sitting side by side in the library, they gradually fall for each other in the course of everyday school life. But family opposition and misunderstandings are hard to escape. Su Yan's adoptive parents are harshly against them, while a crisis of trust sparked by Jiang Chi's childhood friend leads sensitive Su Yan to run away for a while.
But the blazing sun never gives up on melting a glacier. Jiang Chi clears up their misunderstandings with persistence and honesty. They support each other through the pressure of the college entrance exams and eventually get into the same university, beginning a new chapter of sweet romance: cheering each other on at boxing matches, sharing the warmth of home in their rented apartment, handmade scarves in the depths of winter, and a marriage proposal witnessed by the whole university after their senior-year thesis defenses.
From high school through the rest of their lives, the aloof top student and the fiercely protective school tough guy choose each other wholeheartedly. There is no melodramatic heartbreak, only a steadfast love that endures through time. They prove that when the blazing sun crashes into a glacier, it does not bring destruction, but warmth.