At twenty-nine, Lin Jianwei faces a layoff, and in her moment of despondency, she gets to know the programmer Zhou Yan. The two propose the concept of the twenty-fifth grid, mining the fragmented time outside of people's twenty-four hours to build an offline market for skill exchange. On the entrepreneurial path, they encounter their ideas being plagiarized, and the platform successively exposes various risks. The team adheres to their original intention to hold the bottom line, rejecting the quick-success temptation of capital. Relying on the city partner model, they move forward steadily, turning fragmented time into a bond of sincere connection between people, and also finding their own life direction.