Song Gun Hee

Criminal profiler Kang Tae Joo is pulled out of retirement by a chilling summons: an imprisoned serial killer has been linked to additional unsolved deaths through DNA evidence, but he insists that Tae Joo joins the investigation, believing that Tae Joo can prove his innocence. Tae Joo is brought back into a world he thought he'd left behind 33 years earlier, forcing him to face ambitious prosecutor Cha Si Young, with whom he shares a difficult past, in pursuit of the truth. But as with many cold cases, the truth isn't as straightforward as it seems - and Tae Joo might be more involved than even he knows. Can Tae Joo finally close the chapter on the "Scarecrow" murders for good, or will a new twist upend his life?

As a fan of idol Ryu Sun-jae, Im Sol was happy fangirling to her heart's content. That is until one day, Sun-jae is suddenly found dead. As she grieves, Sol discovers a curious pocket watch that takes her six years into the past. Before she knows it, Sol tracks down a teenage Sun-jae, and the words "I love you!" spill out. Now, he's totally creeped out by her, but Sol must somehow win over Sun-jae to stop history from repeating. With the clock ticking, can she save her future number one?

Follows the bloody high school lives of mysterious transfer student and killer Gyeo Wool and traumatized high school student Yeo Reum as they meet and get chased down by a criminal organization.