Criminologist Lee Hyun, employed by the New York Police Department, journeys back to Korea spurred by a cryptic email. He seeks to reclaim the fragmented memories lost following his father's brutal murder. Upon arrival at the airport, he de…

Haunted by the creeping influence of Lee Joon-Yeong, the serial killer, and recent unsettling occurrences, Lee Hyun's father fears his son is transforming into something monstrous. Driven by this dread, he confines Lee Hyun to the basement,…

Working with Lee Hyun, Team 1 compiled a profile of the victims. Meanwhile, Cha Ji-An hurried to the next potential target, successfully apprehending the suspect. However, the capture proved problematic; lacking concrete evidence, the victi…

Yang Seung-Hoon departed on the first flight to China. Inside Cha Ji-An’s computer, accessed without authorization by Lee Hyun, were details of his drug trafficking, information subsequently relayed to Chinese authorities. Upon arrival, the…

Consumed by restlessness and a thirst for answers, Cha Ji-An seeks out Lee Hyun’s company. Together, they manage to evade capture by taking refuge in a closet at the crime scene. During his time hiding at her apartment, a quiet intimacy blo…

Lee Hyun met with Prosecutor Shin Jang-Ho to discuss the Park Young-Chul case. Jang-Ho revealed that Lee Hyun had suffered two episodes of memory loss directly related to the deaths of his parents. He also noted a peculiar detail about Lee …

Lee Hyun pressed Cha Ji-An regarding her reservations about him, her unspoken suspicion that he might resemble Lee Joon-Yeong. He suspected Lee Jung-Ha was shielding Lee Jin-Woo. Meanwhile, Team 1 successfully solved the murder of Park Jeun…

Chi Ji-An suffered a vicious attack in her home, and Attorney Jung intervened to help her. Lee Hyun found the circumstances unsettling and questioned him directly about the possibility of Yang Seung-Hoon's involvement. Following her hospita…

The Planning Officer remained tight-lipped with Lee Hyun about his history concerning Joon-Young. Team One was assigned to a new serial killer case, one involving stalking and missing persons. Detective Son’s blind date, Ji Hyun-Sook, vanis…

Do Jae-Shik and Kang Seong-Eun, the serial killers, take Cha Ji-An captive and wound Team Leader Kang with a knife. Lee Hyun, Attorney Jung, and Pathologist Lee join Team 1 in a desperate attempt to capture the perpetrators. Planning Office…

Detective Jang’s missing notebook materialized unexpectedly at Lee Hyun’s residence. Guided by its contents, Ji-An and Lee Hyun journeyed to the former home of Lee Joon-Yeong. There, they unearthed a casket containing skeletal remains that …

Police apprehended Joo Yeong-Jae’s mother on charges of abuse; she had witnessed the assault but failed to intervene. Meanwhile, Na Bong-Sung furnishes Lee Hyun with sufficient evidence to substantiate his conviction that Attorney Jung is, …

Driven by a desire to inflict pain on Lee Hyun, Jo Yong-Woo ambushes Lee Min. Fortunately, Cha Ji-An arrives just in time to halt Yong-Woo’s attack, though the assailant manages to escape. Lee Hyun confronts the Planning Officer and Deputy…

The revelation of her father’s death left Cha Ji-An consumed by a desire for vengeance, though she must now temper that impulse with the pursuit of justice. Lee Min’s plans to live with Lee Hyun are thwarted when he decides to move in with …

Lee Min discovers Chai Ji-An pilfering from Lee Jeong-Yeong’s private room, yet permits her departure with a collection of photographs he'd taken of children under his care. Joon-Yeong addresses Lee Hyun with a pointed question: "Could you …

The memory of avenging his mother’s death, and the significance of Lee Min’s cards, haunted Lee Hyun. Cha Ji-An urged Lee Min to surrender, emphasizing the inherent wrongness of inflicting pain on others, warning that their shared future wo…