"You taught me love, they taught me pain - now I have to teach myself to live."
In the summer when I was eighteen years old, the cicadas were chirping very noisily. Zheng Yang placed the letter on Gu Yan's desk, and drew a hasty sun on the letter paper with a black gel pen.
On a rainy night when he was twenty-six years old, Gu Yan took out the letter that had been dusty for a long time and found that there was a line of small words written in it:
"If one day I am no longer brave, remember to burn it for me."
Concept: Eighteen-year-old Zheng Yang is like fire, and twenty-four-year-old Gu Yan is like water. When they meet again two years later, the fire has cooled down, but the water is boiling.