Shen An, a top criminal profiler, reunited with the forensic ex-girlfriend Lin Xi in a perfect crime, and fell to his death after failing to chase the murderer. When he opened his eyes again, he went back to seven days ago, the first day when the case occurred. He is forced into an endless cycle of death. In the seven days of each reset, he must race against time to solve the murderer's ever-changing perfect puzzle; he must also fight against forgetfulness, clumsily correcting past mistakes in the eternal blank of his lover's memory, and reopening her closed heart. When the secret of the cycle connected with the truth about the murderer, Shen An understood that he not only had to seize the only way to survive, but also at the end of time, he had to seize the hands he had let go.
