Zhou Yun, a doctor of mathematics, was co-founding a business in a strange city when he met Li Mengqin, who had been married before. During the contact and understanding, love spread quietly like mist, but it was hidden under secular pressure and family obstruction. Behind the bustle of entrepreneurship are hidden interests. After an experience of career failure, Zhou Yun left that strange city with regrets that he had not expressed his feelings for Li Mengqin. But many years later, because of the sudden appearance of Li Mengqin's eldest daughter, Zhou Yun returned to his hometown, silently guarding the love he had never truly had.