Traveling Through the Old Steam Era? I Have a Palace of Thought

(Not a harem, not invincible, not systematic, not brainless, the protagonist's IQ is online throughout, but not crushing) The detective chasing the fugitive accidentally entered the magic circle and traveled back to the old steam era. Weird, stars, radiant ones, Kingdoms, gods, old times. On the surface, it looks the same as the original medieval world, but how many undercurrents are hidden behind the scenes? The gods are resurrected and the old days are coming. Can Yang Boen, who has the palace of thought, complete the Book of Truth and return to his hometown where he thinks about it day and night?