A meritorious criminal police officer who died in the line of duty in his previous life was shot and died during an operation to arrest gangsters. When I opened my eyes, I was transported back to 1992, when I had just put on a police uniform and worked as a rookie at the police station. With criminal investigation concepts, technical knowledge and the memory of unsolved major cases that are thirty years ahead of his time, how will he use this "prophet" to uncover hidden demons in an era of rudimentary technology, make up for the regrets of his previous life, and write a police legend of his own?