Who Is the Murderer(2021)

Who Is the Murderer is a crime thriller series that reunites a guilt-ridden detective and an ambitious intern sixteen years after a bungled arrest allowed a serial killer to escape justice. The cop has spent years haunted by the case, while the intern becomes obsessed with solving it. Together they dig into cold evidence and hidden testimonies, uncovering dark secrets that implicate unexpected suspects. As they close in on the truth, they discover the real murderer may be closer than anyone thought—and that the original arrest wasn't simply a mistake. The series balances procedural investigation with psychological tension, exploring how past failures shape present obsessions and how the pursuit of justice can consume those who seek it.