I Remember You

Criminal profiler Lee Hyun returns to Korea after years abroad and joins the Violent Crimes Unit, where he meets the sharp and persistent detective Cha Ji An. Ji An recognizes Hyun from her past and secretly investigates his connection to a childhood incident involving the mysterious psychopath Lee Joon Young. A new serial murder case surfaces that begins to draw Hyun's attention.

Lee Hyun uses his profiling skills to help solve the current murder case while Ji An continues to dig into his past, revealing she has kept a detailed record of him for years. Flashbacks reveal that as a child, Hyun befriended a troubled boy named Do Hyun Soo, who showed signs of psychopathic behavior. The connection between Hyun's missing brother and Lee Joon Young begins to take shape.

The team investigates a new murder that bears hallmarks of a calculated, emotionless killer, prompting Hyun to reflect on his past with Do Hyun Soo. Ji An's obsession with Hyun deepens as she reveals she witnessed something traumatic at his house as a child. Lee Joon Young's shadowy influence over past events becomes increasingly apparent.

Hyun begins to suspect that Ji An knows more about his past than she lets on, and the two develop a tense but growing partnership. The team uncovers a copycat killer pattern linked to Lee Joon Young's old cases. Hyun starts to question what truly happened the night his brother Min disappeared.

A new suspect emerges in the ongoing murder investigation, and Hyun's profiling leads the team closer to a dangerous killer operating with chilling precision. Ji An finally reveals fragments of what she witnessed at Hyun's home years ago, deepening the emotional stakes between them. Hyun grapples with the possibility that Do Hyun Soo may still be alive and connected to current crimes.

The investigation intensifies as the team realizes the killer may be mimicking Lee Joon Young's methods deliberately to send a message to Hyun. Ji An and Hyun grow closer, and she struggles with keeping the full truth of her past observations from him. A crucial clue surfaces suggesting that Hyun's brother Min did not simply disappear but may have been taken by Joon Young.

Hyun confronts Ji An about her hidden files on him, forcing her to partially reveal why she has tracked his life for so long. The murder cases converge as the team identifies a pattern pointing to someone deeply familiar with Lee Joon Young's psychology. Hyun begins to emotionally open up, though the mystery of his brother's fate continues to haunt him.

A shocking revelation suggests that Do Hyun Soo may have assumed a new identity and could be living among ordinary people. Ji An and Hyun work closely together to profile the suspect, and their emotional bond deepens into something more personal. The team faces danger when the killer appears to target someone close to the investigation.

Hyun begins to seriously suspect that a person in his current life may be the grown-up Do Hyun Soo, creating internal conflict about loyalty and truth. Ji An's past trauma connected to Lee Joon Young is more fully revealed, explaining her lifelong fixation on finding Hyun. The killer makes a bold move that puts a team member at risk and raises the stakes dramatically.

The identity of Do Hyun Soo's new persona inches closer to being exposed as Hyun pieces together behavioral clues from those around him. Ji An and Hyun share a significant emotional moment, acknowledging their growing feelings amid the dangerous investigation. Lee Joon Young is confirmed to be orchestrating events from the shadows, manipulating multiple people simultaneously.

Hyun confronts the person he believes to be Do Hyun Soo, leading to a tense and emotionally charged exchange that blurs the line between monster and victim. Ji An risks her safety to protect Hyun as the killer's game becomes more personal and targeted. The truth about what Lee Joon Young did to young Min begins to unravel in devastating detail.

Do Hyun Soo's true identity is confirmed, and Hyun must reconcile his childhood bond with the person this boy became under Joon Young's influence. The team races to prevent another murder as the psychological chess match between Hyun and Joon Young escalates. Ji An's dedication to Hyun proves pivotal as she uncovers a critical piece of evidence.

Lee Joon Young makes direct contact with Hyun, revealing manipulative insights into Hyun's psyche and his brother's fate with disturbing calmness. The emotional fallout from Do Hyun Soo's revelation affects the team dynamic and forces difficult moral questions about nature versus nurture. Ji An puts herself in grave danger as she closes in on Joon Young's location.

Hyun learns more devastating truths about his brother Min and the years he spent under Lee Joon Young's influence, shaking his understanding of his own past. Ji An is placed in a life-threatening situation engineered by Joon Young to test and torment Hyun. The team marshals all resources as the final confrontation with the master manipulator approaches.

Hyun comes face to face with Lee Joon Young in a tense psychological duel, and the full scope of Joon Young's crimes and manipulations over the decades is laid bare. The fate of Hyun's brother Min is revealed in a heartbreaking and complex truth that redefines everything Hyun thought he knew. Ji An and Hyun lean on each other as the case reaches its emotional climax.

The final episode resolves the fates of Lee Joon Young, Do Hyun Soo, and the team as justice is served in complicated and bittersweet ways. Hyun and Ji An's relationship is given space to bloom now that the shadows of the past have been addressed. The drama closes on a hopeful note, with Hyun finally finding peace with his history and embracing a future alongside Ji An.