This sentence came from the ancient Chinese novel,"Dream of the Red Chamber", which meant that "opera actors enter the painting and wander around the world for their entire lives". In the novel, this sentence expressed the unfortunate fate of opera actors. They often drifted to other places to perform, and it was difficult for them to live and work steadily. It also hinted that their short and uncertain fate could end their careers at any time due to various reasons. This sentence was often used to describe the short-term and impermanence of life, as well as the instability and sense of drifting in the pursuit of dreams.