When his younger brother's life was hanging by a thread in the late stages of uremia, Lin Xia, who was desperate, signed a life-and-death certificate for the "Time and Space Entropy Reduction Project" - if he completed five time travels, he would be able to obtain a huge amount of money to save his younger brother. If it fails, the consciousness will be trapped in the rift of time and space forever.
She was ordered to travel back in time to protect the young chief scientist Lu Chenzhou. However, as she traveled through time and time again, she found that her memory was being ruthlessly devoured, and Lu Chenzhou's eyes looking at her became increasingly complicated and deep. The scar on the back of his hand that exactly matches the one she inflicted, the familiar dialogue he blurts out, the sapphire watch he gave her that echoes her birthmark... All clues point to a breathtaking truth.
When the mysterious hacker issued a warning, and when the files showed that the former volunteers suffered mental breakdowns one after another, Lin Xia finally got to the core of the plan: she was not a randomly selected volunteer, but a "key" carefully selected by Lu Chenzhou across time and space. The butterfly birthmark on the side of her neck is the key code to launch the ultimate experiment.
During her last time travel, Lin Xia stood at a crossroads of fate: saving Lu Chenzhou's past would completely change her present, and she might lose her only chance to save her brother; standing idly by would mean that the man she fell in love with would fall into an abyss of eternal destruction. The time code has been activated, and her choice will rewrite everyone's destiny...
Concept: Use a sci-fi shell to wrap a moving core about love, memory, sacrifice and free will.