The protagonist travels back in time and becomes a handyman in the Imperial Arms Bureau who is on the verge of death in the early years of the Apocalypse. With his vision and craftsmanship beyond his time, he survives in the cracks of the struggle between the Eunuch Party and the Donglin Party, and gradually takes control of the lifeline of the military industry, trying to change his destiny in the chaotic times of the late Ming Dynasty and save the building from collapse.
