Character Relationship Map: A Killer Paradox

Characters

• Lee Tang (played by Choi Woo-shik) — protagonist

  Lee Tang is a recently discharged soldier who works at a convenience store while depending on his parents and dreaming of visiting Canada. After killing an attacker, he discovers the victim was a seri...

• Jang Nan-gam (played by Son Suk-ku) — protagonist

  Jang Nan-gam is a dutiful detective investigating the killing connected to Lee Tang. He remains uncooperative and continues pursuing the case despite uncertainty about whether he has identified Lee Ta...

• Song Chon (played by Lee Hee-jun) — supporting

Story Dynamics

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

• Lee Tang → Jang Nan-gam (Central pursuit) — Tang's actions and Nan-gam's investigation form one of the season's primary narrative lines.

  "Nan-gam is placed on the case in Episode 1, continues investigating the latest deaths in Episode 3, and searches for Tang in Episode 5."

• Lee Tang → Song Chon (Competing killers) — Chon becomes a direct threat to Tang while also pursuing him for his own purposes.

  "Song Chon searches for Tang, Tang agrees to meet Chon, and the endgame leads to a final fight against Chon."

• Jang Nan-gam → Song Chon (Past-linked adversaries) — Their confrontation is shaped by Chon's recognition of Nan-gam and by Nan-gam's role in the pursuit of Chon.

  "Nan-gam comes face to face with Chon in Episode 7, and Chon recognizes him from the past; the final fight becomes everyone versus Chon."

Story Analysis

The single-season narrative follows Lee Tang's escalating crisis, Jang Nan-gam's investigation, and Song Chon's arrival as the force that brings all pursuit lines together.

Plot Progression

1. Season 1: The First Killing — Tang's accidental killing immediately creates a crisis of guilt and concealment. Nan-gam's assignment to the case establishes the season's central investigative pursuit.
2. Season 1: Secrets Under Pressure — A mysterious woman blackmails Tang while Nan-gam struggles to interpret the latest deaths. The pressure pushes Tang toward the idea of surrender.
3. Season 1: The Murder Pattern — Nan-gam's inquiry develops through his search for clues and his unlikely partnership. Recognizing a pattern among the murders gives the investigation a clearer direction.
4. Season 1: Chon's Proposition — Song Chon emerges as a second force searching for Tang and confronts Roh Bin. Tang accepts a meeting, bringing the competing pursuits into direct contact.
5. Season 1: Everyone Versus Chon — Nan-gam confronts Chon, who recognizes him from the past, while Tang and Bin plan an escape. The chase ends in a final fight, followed by Nan-gam's discovery about his father.