"Letter from Shamian" is a dialogue spanning a hundred years in time and space, and it is also an affectionate journey about protection and redemption. The story begins in modern Shamian, Guangzhou, where Su Xiaoxiao, a social worker, accidentally discovers a dusty diary of the Republic of China in the attic of her ancestral home. When she tentatively wrote her greetings, she received a reply from 1928 - Lin Wanqing, an ill-fated girl who was held hostage by her family. As the pen tips come and go, two souls separated by a century establish a wonderful bond. At the same time, Su Xiaoxiao was in tit-for-tat with Lin Jingxuan, the airborne project director because of her work, but discovered in repeated confrontations that the other party was inextricably linked to the history in the diary. In order to solve family grudges and historical mysteries, the two teamed up to conduct in-depth investigations, and gradually fell in love during workplace games and exploration adventures. From the love and hatred in Shamian during the Republic of China to the undercurrents of modern business wars, when the last words in the diary overlap with the pocket watch in reality, a buried revolutionary past and family secrets finally surface. In the end, they not only brought an end to the tragedy of a century ago, but also wrote their own eternal chapter among the red bricks and green tiles.