In a specific time and space, criminal police officer Lu Tianfeng (played by Bai Jingting) accidentally discovered that he had the ability to repeat the cycle five times in the same day from time to time. He used this super power to solve many difficult cases.One day, a murder notice from suspect X suddenly appeared. Several previous cases of suspected X's perfect committing methods made Lu Tianfeng suspect: X also seems to have the super power of time loop.The investigation team headed by Lu Tianfeng joined the investigation of the case.During the investigation, Lu Tianfeng discovered that more and more doubts surround a certain genetic research group.As the investigation deepens, more and more people are involved, including those close to Lu Tianfeng.In the time loop again and again, Lu Tianfeng peeled off the cocoon, and the truth finally gradually emerged.In the end, Lu Tianfeng overcame his own obstacles and solved the case with his teammates; he also gained a more accurate understanding of his superpowers, and he will face new challenges in the new time cycle.