That summer, after the high school entrance exams, cicadas buzzing in the heat, Jiang Huai met Yan Huai on a tree-lined avenue. They soon discovered they were neighbors as well as classmates, and quickly grew close and fell in love. After graduation, they became anti-narcotics police officers and spent ten years undercover. For seven years, neither knew whether the other was alive or dead. Then, after a final unexpected turn of events, they met again.