Character Relationship Map: Forgotten

Characters

• Jin-seok (played by Kang Ha-neul) — protagonist

  The protagonist who suffers from dissociative amnesia after a traumatic event in 1997. He was hired to commit a murder to fund his brother's surgery during the financial crisis, but accidentally kille...

• Yoo-seok / Choi Seong-uk (played by Kim Moo-yul) — protagonist

  Jin-seok's older brother who was replaced after a 19-day abduction. He is actually Choi Seong-uk, the son of the murdered doctor, raised in an orphanage. He orchestrates the hypnosis and reenactment t...

• Jin-seok's Father / Mr. Park (played by Moon Sung-keun) — supporting

  A psychiatrist hired by Choi to pose as Jin-seok's father during a hypnotic reenactment. He helps guide Jin-seok back to his repressed memories of 1997 to recover details about the murders.

• Jin-seok's Father / Madam Min (played by Na Young-hee) — supporting

  An actress recruited by Choi to portray Jin-seok's mother during the therapeutic reenactment. She participates in the hypnotic sessions to help trigger Jin-seok's repressed memories of the 1997 events...

• Professor Choi (played by Nam Myung-ryeol) — supporting

  The doctor who hired Jin-seok to murder his own wife for insurance money during the 1997 financial crisis. After discovering Jin-seok killed his daughter, he attempts to kill Jin-seok but accidentally...

• Professor Choi's Wife (played by Lee Na-ra) — supporting

  The mother of the murdered girl and wife of Professor Choi. She was the intended target of the 1997 contract killing but ends up accidentally killed by Jin-seok after her daughter's death.

• Girl (played by Jung Chan-bi) — supporting

  The young daughter of the murdered couple in 1997. She witnesses Jin-seok holding a knife, screams, and accidentally falls onto it while he tries to quiet her, leading to her death and her mother's su...

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Professor Choi's Wife → Professor Choi (wife)
• Jin-seok's Father / Madam Min → Jin-seok (father)
• Jin-seok's Father / Mr. Park → Jin-seok (father)
• Yoo-seok / Choi Seong-uk → Girl (Family Brother) — The Girl's murder is the central trauma behind Choi's revenge.

  Choi reveals that he is the doctor's son whom Jin-seok spared twenty years earlier. The Girl is identified as the doctor's daughter, making her Choi's...

• Jin-seok → Yoo-seok / Choi Seong-uk (Family Younger Brother) — They are presented as brothers, but their relationship is later exposed as an identity deception.

  Jin-seok moves into the new home with his older brother Yoo-seok. The returning Yoo-seok is later revealed to be Choi Seong-uk, who replaced Jin-seok'...

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Jin-seok → Girl (Conflict Killer And Victim) — Jin-seok's attempted silencing of the Girl leads directly to her death.

  In 1997, the Girl sees the knife in Jin-seok's hand and runs away screaming. While he tries to open the door, she is accidentally stabbed.

Story Analysis

A man with dissociative amnesia reconstructs the murder he committed and confronts the survivor seeking revenge.

Plot Progression

1. The Brother Who Returned — Jin-seok enters a new home and witnesses his brother's abduction. When Yoo-seok returns after nineteen days, his strange behavior creates an atmosphere of suspicion.
2. A Missing Twenty Years — Jin-seok investigates the apparent impostor and seeks help from the police. Modern technology forces him to confront the fact that his memories have skipped twenty years.
3. The House of Revenge — The forbidden room exposes a murder scene and Choi's substitution of the real Yoo-seok. Choi explains that Jin-seok was identified as the killer of his family.
4. Memory Under Pursuit — A psychiatrist designs a reenactment to recover Jin-seok's memories, but the plan is disrupted by Choi's arrest. The escape and vehicle crash bring Jin-seok to the hospital, where his memories return.
5. The Sin Beneath Memory — Jin-seok remembers the financial pressure, the hired murder, and the deaths of the Girl and her mother. In the present, he and Choi face the truth and both choose death.