I Have the Power of Reconstruction, and I've Become Miss Holmes's Assistant?

At first, Bai Shixi thought it was all because something was a little off with his mental health, making him have lucid dreams for a long time. Whenever he fell asleep, he would find himself in nineteenth-century London, but this London was nothing like the one he had seen in history books: supernatural mysticism, the Fifth Department in charge of mystical incidents, a famous detective and a criminal professor entirely unlike those in his memories...

Everything he experienced in his dreams kept crashing into his worldview like an out-of-control dump truck. He thought it was all just a dream, until he woke up one day and discovered that the injuries he had sustained in the dream had carried over into reality. Only then did he realize with a shock that none of it was a dream. It was all real.

His worldview had been smashed to pieces by a dump truck.