A Generation of Genius Doctors and Soldiers Actually Traveled Through Time and Space into Ancient Bloody Dramas

There is an organization in the fictional world that specializes in traveling through books to complete tasks. As a member of the organization, the protagonist Yan Xi is ordered to travel into various books. Due to a mechanical failure during an operation, Yan tide is still unable to return to the original world after completing the task. Concept: (If my story requires a special explanation of concept, then I have failed as an author.