When Mu Chen dreamed for the seventh time of the bone hand behind the bronze door gouging out the heart, the electronic clock revealed oracle bone inscriptions. The woman in white cheongsam holding his heart in an abandoned apartment, the mechanical spider with a human face on the ceiling, the escape tunnel embedded with bronze gears - these surreal images all confirm an absurd fact: he is a defective product of time and space that should not exist.
Every twelve years, his memory is reset. Xiao Xiyue, who calls herself the tailor of time and space, brings a blood-stained pocket watch with a countdown to his death engraved on it. The clockwork vendors in the West City of Chang'an, the gear prisoners in the Ming Dynasty's prisons, the bronze heart of the cyber city... Every mirrored time and space is repeating the same conspiracy: an ancient existence called the "Lord of the Gate" is rewriting reality into a mechanical divine kingdom through the Bronze Secret Cult that is parasitic in the cracks of history.
What was beating in Mu Chen's chest was the only key that could end this cancer of time and space - the price was that he had to personally tear apart the person who kept falling in love with Xiao Xiyue in all reincarnations.
Muchen discovered that he was the reincarnation of the gatekeeper from three hundred years ago, shouldering the important task of guarding the Bronze Gate. The forces of darkness are back, coveting the power behind the door. With Xiao Xiyue's help, he embarks on an adventure to find the three keys and stop the conspiracy.
However, the truth is far more complicated than imagined. Trust and betrayal are intertwined, memory and identity become a mystery. When the Bronze Door opens again, what fate will Mu Chen face?
