Character Relationship Map: Kill It

Characters

• Kim Soo-Hyun (played by Jang Ki-yong) — protagonist

  A gifted veterinarian by day and one of the world's most efficient assassins by night. Governed by cold logic and anonymity, his life unravels when he is drawn into a deadly pursuit by a detective, fo...

• Do Hyun-Jin (played by Nana) — protagonist

  A brilliant and determined detective driven by a sharp instinct for justice and haunted by a personal loss. Her investigation into mysterious murders leads her to pursue Kim Soo-hyun, ultimately uncov...

• Yoon Jung-Woo (played by Ji Il-ju) — supporting
• Philip An (played by Lee Jae-won) — supporting
• Kang Seul-Ki (played by Roh Jeong-eui) — supporting
• Do Jae-Hwan (played by Jung Hae-kyun) — minor
• Pavel (played by David Lee McInnis) — minor

  A European contract killer who, stricken by guilt over a failed assassination order, spares young Kim Soo-hyun and raises him as an adopted son. Pavel trains him in assassination while urging him to l...

• Jeong So-yeon (played by Jung Jae-eun) — cameo
• Yoon Ji-hye (played by Ok Ji-young) — cameo

Canonical Relationships

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

• Do Jae-Hwan → Kim Soo-Hyun (Hunter and Prey) — A professional antagonism where Soo-hyun actively uncovers Jae-hwan's hidden history and criminal ties.

  "S1E6 and S1E8 show Soo-hyun investigating Jae-hwan's past ambitions and terrible actions, creating a hunter-prey dynamic."

• Do Jae-Hwan → Do Hyun-Jin (Investigative Crossroads) — Hyun-jin's police work intersects with Jae-hwan's circle, making him a subject of her official inquiry.

  "S1E11 notes Hyun-jin's investigation into the connection between Soo-hyun and Jae-hwan, placing her in his professional crosshairs."

Story Dynamics

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

• Do Jae-Hwan → Yoon Ji-hye (Suspicion and Obstruction) — A tense dynamic where Jae-hwan views Ji-hye as a potential threat to his operations, leading to strategic suspicion.

  "S1E9 explicitly states Jae-hwan is suspicious of Ji-hye, fearing her actions will jeopardize his plans."

• Do Jae-Hwan → Philip An (Information Broker) — Phillip serves as a peripheral information node that indirectly connects to Jae-hwan's network and targets.

  "S1E7 and S1E8 describe Phillip being used to source information and draw out targets linked to Jae-hwan's operations."

• Do Jae-Hwan → Pavel (Rival Faction) — Pavel operates as an external threat within the same criminal ecosystem, creating indirect conflict with Jae-hwan's interests.

  "S1E3 references Karimoff (Pavel) escaping and striking back, linked to the mastermind behind Jae-hwan's circle."

• Do Jae-Hwan → Kang Seul-Ki (Case Connection) — Seul-gi's backstory is woven into the larger investigation that eventually points toward Jae-hwan's influence.

  "S1E5 mentions Seul-gi's traumatic past being investigated by Hyun-jin, which ties into the broader case surrounding Jae-hwan."

• Do Jae-Hwan → Yoon Jung-Woo (Peripheral Associate) — Likely a minor figure within the broader network, with no direct narrative intersection documented.

  "No direct plot mention, inferred as peripheral to the central investigation based on case scope."

• Do Jae-Hwan → Jeong So-yeon (Peripheral Associate) — Likely a minor figure within the broader network, with no direct narrative intersection documented.

  "No direct plot mention, inferred as peripheral to the central investigation based on case scope."

Story Analysis

Overall narrative architecture across all 1 seasons

Plot Progression

1. Season 1: Shadows Emerge — The investigation begins with a high-profile death, introducing the vet killer and Russian mafia ties. Tension builds as hostages are taken and childhood memories surface.
2. Season 1: Unraveling Past — Investigators dig into traumatic histories and orphanage records. Jae-hwan's ambitions are recalled, and Soo-hyun faces a moral crossroads while memory fragments return.
3. Season 1: Crossroads and Betrayal — Assassinations occur as information brokers are pressured. Soo-hyun's past aligns with Jae-hwan's actions, while Ji-hye's disappearance jeopardizes the entire operation.
4. Season 1: Revelation and Standoff — Soo-hyun's identity is exposed, forcing him into hiding. The season peaks with a final target confrontation, ending on a tense cliffhanger as Hyun-jin intervenes.