What can you do in three seconds?
For Shen Zhiwei, three seconds was enough to foresee death - her partner Gu Yechen's knife stabbed into her chest.
She resigned, moved, and set up counterattacks, only to find that this seemingly gentle man could always predict her predictions. At two o'clock in the morning, he stood downstairs: "Open the door and I will tell you the truth."
The file bag contains top-secret documents from 2030: She is the culprit who caused the timeline to collapse, and he is the one who traveled back to stop her.
"You were right," he said. "Someone's going to die. It's me."
Later she learned that he was not here to kill her, but to die for her.
He later learned that she would rather destroy the timeline than watch him close his eyes.