Seventeen-year-old Ye Chen is quiet and gentle, like a clear lake destined to dry up. He suffered from an incurable heart disease since he was a child. After his father died in a plane crash, he stayed in his empty home alone and became accustomed to pain and loneliness.
Seventeen-year-old Lu Xiao is cold and sharp, like a knife tempered by blood and hatred. His father's violence during his childhood made him close himself off, and his mother's secrets made him hate the world.
Fate made them meet again in the third year of high school - Ye Chen is the little sunshine with a warm smile in the class (only on the surface, because the early death of his mother and his father's subsequent accident caused him great psychological trauma) and Lu Xiao is a lonely genius who transferred from another school. (Chinese is not very good)
They were both each other's most important friends when they were young. They could have passed each other, but fate did not allow it.
But Ye Chen remembered that that night when he was six years old, he had stood in front of Lu Xiao who was beaten by Ou; and Lu Xiao also remembered that the heart of the boy who was beaten for him was now failing little by little.
"If your life is destined to be short, at least let me be your last light."
"If your heart is destined to stop, I will let it beat forever in my memory."
From the classroom to the ward, from the maple forest in autumn to the first snow on winter nights, they redeem each other and help each other. Until the day when the college entrance examination ended, the sunset dyed the curtains of the ward red, Ye Chen's electrocardiogram returned to flat, and Lu Xiao held his hand, making the last vow at the boundary between death and eternity——
"I will carry your heartbeat and survive."
"Did you know? When the sunset is at its most beautiful, it has actually already fallen below the horizon."
"What we see is actually the last light before it dies."
…
Concept: Lovers separated by yin and yang