I mostly read popular science books or books without romantic storylines, but if we’re talking about universes I would like to write in, then:
Andy Weir's books, Do Androids Dream of Electric Sheep? by Philip K. Dick, and The Hitchhiker’s Guide to the Galaxy by Douglas Adams (I do love space books).

also books about Sherlock Holmes, where one of taekook is something like Sherlock and the other is Watson 🥰

i also imagine taekook in Heaven Official’s Blessing and ErHa settings 🫶🏻 I want to reread them just to imagine taekook 😭