Trace inspector Lu Chen has the ability of "death flashback": whenever a case comes to a dead end on the eve of closing, he will return to an earlier safe node and start over. Going back again and again, he discovered that someone was systematically erasing key names in the case. The past of the Binjiang shipwreck twenty-eight years ago, the revised files, the old detective who refused to retire... All clues point to one truth - if the real murderer cannot be found within the time limit, the case will not be sold, and he will not be able to get out of that cycle. Hard-core criminal investigation × time loop, a murder-hunting journey about memory and obsession.