In Pei Xian's youth, there is a secret called Jiang Wan.
He was the unruly boy in the class next to hers. He would put lemons in her water glass with a wicked smile, and he would fight off all the bullies for her in the alley.
One hundred love letters were Pei Xian's silent secret love throughout high school.
She thought that on the day of graduation, she would muster up the courage to hand the last letter to him.
But later, someone else stood beside Jiang Wan.
Pei Xian burned the ninety-ninth letter, buried everything, and rushed to a future without him.
At the age of twenty-seven, Pei Xian heard the news of Jiang Wan's death at a class reunion.
The young man who was as dazzling as the scorching sun had already fallen asleep in the cold winter three years ago.
Until she received his mother's relic - a rusty iron box.
Inside, her ninety-nine love letters lay neatly.
On the back of each letter, there is his familiar handwriting, filled with replies spanning ten years.
The last page is the words he wrote with trembling after he was diagnosed with terminal illness:
"Pei Xian, if time could go back to the afternoon of my senior year in high school..."
"I must tell you first, I like you so much."