On the first day of transferring school, Xu Zhixia accidentally went to the rooftop and bumped into the school bully Jiang Ye. He picked up the lemon candies she dropped and said, "The rooftop is mine. Next time, bring two boxes of candies."
Later she found out - Jiang Ye blocked her fights, walked half way across the city to send her home, and stayed up all night copying math notes, but he just refused to say anything.
She also learned that her mother, whose surname was Lin, was forced to death by the Jiang family. Grandma said, don't touch anyone from the Jiang family.
She avoided him for three days. He peeled off a piece of candy and fed it to her: "They settled the bill. I owe you the candy. I acknowledge it."
At her wedding ten years later, he sent a note: "Go and see the sea."
The old scar on his collarbone was left by protecting her when she was a child - they have forgotten it, but the body remembers it.