Zhao Xuan and Cheng Zhong were good friends when they were young. When Cheng Zhong was transferred back to his hometown with his parents in high school, the two lost contact until they became classmates again as graduate students. After graduating with a master's degree, Zhao Xuan stayed in school to study for a Ph. D., Got married and had children with his classmate Zhou Jing, but lost contact again with Cheng Zhong who went to study in the United States.
Seven years later, Cheng Zhong suddenly returned to China to investigate the unsolved case of the murder of Li Mei, a school beauty at the same level ten years ago, and reunited with Zhao Xuan again.
With the participation of Zhao Xuan, reporter Lin Xiaowei, and police officer Zheng Hao, they finally learned the truth about that year after many twists and turns.
Many unknown secrets are gradually revealed, and everyone's destiny changes as a result.
(Special note: This story is purely fictional.)