A chilling wave of dread swept across the nation with the news of an unsolved serial killing spree. Fear became a pervasive shadow, clinging to everyone. Then, a family of four sought refuge in a remote campsite, unaware they were walking d…

Inside the prison, Moo Chi confronts the Head Hunter, declaring his intention to not only kill him but also to track down his son and inflict the same suffering he had endured. Simultaneously, a series of murders continues, each discovery m…

Chi Kook was discovered at the prison, his body bearing numerous stab wounds and a message scrawled in blood. Shortly thereafter, Chi Kook's watch – a gift from Ba Reum and Dong Koo – was found at the scene of the murder on the grape farm. …

Following the murder of Bong Yi’s grandmother and the discovery of a peculiar finger at the church, Moo Chi and his team intensified their investigation. A sense of unease settled upon Moo Chi regarding Doctor Sung Yo Han, though concrete p…

A live broadcast, lasting a full hour, commenced with the desperate hope of saving Han Kook. Meanwhile, Ba Reum embarked on a clandestine journey, while the others worked tirelessly to discern the killer’s motive. Throughout the broadcast, …

Following Moo Won's brutal death, Moo Chi surrendered to despair, finding solace only in drink. With Han Kook still missing and his life in peril, the police had yet to uncover any leads regarding the killer. As Moo Chi regained his strengt…

Yo Han is in critical condition following a gunshot wound. Meanwhile, Ba Reum undergoes brain surgery, but afterward experiences memory loss. A year later, Moo Chi is transferred to a new team tasked with gathering and organizing criminal e…

Ba Reum’s innate intuition guides Moo Chi closer to the truth of the knots, though he is plagued by jarring flashbacks that feel utterly foreign. As they investigate the suspects, Moo Chi and Ba Reum notice a man who distinguishes himself f…

A year after his brain surgery, Ba Reum uncovers a disturbing truth about the procedure. Unbidden memories now plague him, relentless in their return. Detective Ko, incensed by Han Seo Joon’s claim of salvation and peace found through Chris…

Ba Reum is increasingly prone to violent outbursts, a disturbing trend that threatens his self-control. The urge to kill surfaces within him, a chilling realization of his weakening restraint. He fears the entity within – Yo Han – is gainin…

The voice of Yo Han echoed relentlessly within Ba Reum's mind, a constant command to kill. This insidious hallucination culminated in the murder of Woo Hyung Chul. When Ba Reum arrived at the station to confess, he discovered that all evide…

Following Kang Duk Soo's death, Ba Reum meticulously monitors the unfolding investigation, striving to maintain a strategic distance that safeguards his secret. Meanwhile, Bong Yi firmly believes Moo Chi is responsible for the killing and r…

The DNA evidence recovered from the murder weapon perplexed Moo Chi. Bong Yi joined Hong Ju's team, immersing herself in the investigation of the Suseong serial killings. Alongside Ba Reum, she began to discern a connection between the Suse…

Ko Nam, a sharp and perceptive boy, discovers a chilling rumor circulating in his neighborhood – that someone is killing cats. He confides in Bong Yi, promising to share the details of his own investigation. However, fate intervenes, and Ko…

A flood of memories returned to Ba Reum, each one a sharp pang of guilt. The sight of Han Kook’s mother, still searching for her daughter a year later, ignited a resolve within him. He would confess his actions, clear Yo Han's name. Elsewhe…

The news of Chi Kook's unexpected passing sent a shockwave through everyone who knew him. Ba Reum, grappling with the sudden loss, made a heartfelt plea to Chi Kook’s mother, urging her to consider requesting an autopsy. Simultaneously, Det…

A clarity dawns on Ba Reum; the truth of his family's fate coalesces in his mind. He plots a snare for the enigmatic OZ, and in doing so, uncovers a hidden aspect of Dr. Daniel Lee. Separately, Moo Chi discovers the vehicle used by the OZ –…

The truth of Ba Reum's culpability struck Moo Chi with brutal force. He launched himself at the man in the station, a furious charge fueled by betrayal. Suspicion also gnawed at Moo Chi regarding Detective Lee’s possible connection to the O…

Moo Chi and Bong Yi draw nearer to the truth. Meanwhile, Ba Reum seeks his aunt, the final piece of a fractured picture. Sang, attempting to verify Ba Reum's account, discovers something unsettling within his home.

Ba Reum resolved to surrender, determined to complete one final mission – a task uniquely suited to his skills. During her last appearance on the show with Hee Jin, Hong Ju finally confided a long-held secret, one that had haunted her for y…