After Time Travel, Relying on My Sister to Reach the Peak of Life

[Multiple heroines + time travel + imaginary world] A young man named Dong Cheng traveled through time and became a dying "Dong Cheng" in another world. Fortunately, her "sister" rescued her. Not only that, this incident also directly contributed to her determination to recognize Dong Cheng as her "master"? ! It turns out that "sister" Lilith is the "Key of God" with powerful power, and can also conjure money out of thin air? Doesn't this make her want to expend some gold coins? I thought I had reached the pinnacle of my life, but the system that came from nowhere told Dong Cheng something terrible... Lilith's past? Unknown enemy? Undercurrents of empires and kingdoms? All kinds of strange people and things happened one after another, and the truth gradually emerged... And behind the "truth", may there be a bigger conspiracy?