Lin Xia and Lu Chen both went back to three years ago in an explosion. She was once the perfect victim of the serial killer "Nightingale", and he was a detective who died in the line of duty trying to find out the truth. This time, Lin Xia disguised herself as an innocent school beauty and approached the murderer, but Lu Chen found the same traces of rebirth on her body as his own. When the two test each other in the time paradox, a bigger conspiracy emerges - behind the nightingale, there is a third-party force that can control time...