Encountering a Fantasy World After Traveling Through Time

A story about ordinary people traveling through a different world, observing it, integrating into it, changing it, and being changed by it at the same time. The focus of this book is to describe a world of swords and magic through the protagonist's experience, rather than to create an invincible protagonist. It's slow-burning, unsystematic, not a cool novel, and the protagonist is an ordinary person.