Lu Zi

She (played by Lu Zi) is a top bodyguard in the security industry, while he is a key decoder who holds the key to a crucial password. To protect him and an encrypted disk that can expose the shady technological secrets, she engages in a life-and-death chase with various hunters. When her relatives betray her and trust collapses, she must choose between professional rules and justice in her heart—should she fight her way out for him or fight alone for the truth?

In a small town, twelve mysterious letters and a 35-year wait intertwine to shape the lives and loves of a close-knit group of friends. Yu Nian and Shen Cheng’s world is thrown into turmoil when their parents vanish, followed by cryptic messages arriving from another time. Driven to uncover the truth, they plunge into a complex puzzle, navigating dual timelines and unraveling the secrets hidden within the letters that could explain their disappearance.

Set in a Western-style house in Shanghai's French Concession, the film spans decades of change. Once home to the Lin family, the house is transformed into a maternity hospital in the 1930s, then a factory in the 1950s after the founding of the People's Republic of China. By the 1990s, it becomes a mixed-use building, with each era bringing new stories of the people passing through its doors.