Character Relationship Map: Doubt

Characters

• Jang Tae-su (played by Han Suk-kyu) — protagonist

  Jang Tae-su is a renowned criminal profiler and one of the pioneers of criminal behavior analysis in South Korea. As a respected police professional and single parent, he raises Jang Ha-bin while inve...

• Jang Ha-bin (played by Chae Won-been) — protagonist

  Jang Ha-bin is Jang Tae-su's daughter, whom he raises alone after the death of her mother. As a child, she was kept largely confined and repeatedly questioned because Tae-su suspected she pushed her b...

• Koo Dae-hong (played by Roh Jae-won) — supporting
• Oh Jeong-hwan (played by Yoon Kyung-ho) — minor
• Choi Young-min (played by Kim Jeong-jin) — minor
• Park Joon-tae (played by You Eui-tae) — minor
• Jeong Doo-cheol (played by Yu Oh-seong) — cameo

Canonical Relationships

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

• Jang Tae-su → Jeong Doo-cheol (Professional Mentor) — Senior-professional relationship in criminal profiling
• Jang Tae-su → Park Joon-tae (Professional Colleague) — Professional relationship in police force
• Jang Tae-su → Choi Young-min (Professional Colleague) — Professional relationship in criminal investigation
• Jang Tae-su → Oh Jeong-hwan (Professional Superior) — Professional hierarchy within police department
• Jang Tae-su → Koo Dae-hong (Professional Colleague) — Professional relationship within police structure
• Jang Tae-su → Jang Ha-bin (Family Father) — Strained father-daughter relationship due to suspicion of her involvement in brother's death

Story Analysis

The single-season narrative follows a profiler whose professional investigation collides with his responsibility toward a daughter suspected of serious crimes. The story moves from suspicion through escalating evidence to revelation, guilt, and an uncertain family future.

Plot Progression

1. Parental Duty and Suspicion — A celebrated profiler struggles with his failures as a parent when his daughter becomes connected to a suspicious death. Evidence and an independent investigation begin to challenge his trust.
2. Evidence Opens Another Case — The profiler investigates his daughter's alibi while a keychain links the current investigation to another case. Repeated questioning and a shocking call deepen the uncertainty.
3. A Second Murder — Another murder renews suspicion toward the daughter and pushes the profiler to question her involvement. A person connected to the case turns himself in, but the danger continues.
4. Investigation Closes In — A mysterious envelope, blackmail, and a newly discovered secret intensify the investigation. The daughter is increasingly treated as a possible killer.
5. Truth and Guilt — Seized evidence brings the profiler face to face with a shocking truth, and the true killer is revealed. The unclear motive, continuing intent to kill, and resulting guilt leave the family's future un...