This made me have an existential crisis. I loved how it had a perfect mix of plot, world building, romance, and mystery. It always kept me hype and I never got bored reading this despite it being so long. Despite being complex, it still beautifully explained and simplified concepts to readers. I was shocked at how the author chose to expand the idea of "transmigration" not with fantasy and made-up concepts, but rather with technology that could ACTUALLY become possible.
Concubine Walkthrough