The idea is a widely used idea in novels written by Chinese, where a man who is a cinephile or works in something related to Hollywood. He travels back in time, the time period is at the writer's choice. He sees that he has a chance to make it in the entertainment industry. In the profession of the writer's choice, which could be; director, producer, actor, star manager, writer of books or movie scripts, etc.
In general, it tells how he enters the entertainment world, the interactions he has with people in the industry, and the different relationships he has. Until he succeeds in his goal.
It's an idea I published years ago, perhaps it can inspire some writer.
Time travel, Hollywood