I'm the Bookshop Manager, Transmigrated Across the Three Realms to Become an Evil God

Synopsis: [Transmigration + Other World + Cultivation + Urban + No Female Lead] (The story will keep transmigrating between three worlds. If that works for you, give it a try. Chapters one through three introduce each world, so the pace is a little fast at first. It slows down afterward.) Wu Yuan transmigrates between the three realms and becomes a shopkeeper. As the realms become increasingly entangled with his own identity, it grows shrouded in mystery. To discover who he is, Wu Yuan unites the three realms and makes his way into an ancient land. Now that he knows his identity, what will Wu Yuan choose? Will he betray the three realms that have followed him, or embrace his identity and make an enemy of all things...?