Character Relationship Map: Iris

Characters

• Kim Hyeon-Jun (played by Lee Byung-hun) — protagonist

  A highly capable 707th Special Mission Group soldier recruited into NSS alongside his closest friend, Jin Sa-Woo. He falls in love with Choi Seung Hee, survives a betrayal and an attempted assassinati...

• Jin Sa-Woo (played by Jung Jun-ho) — supporting

  A 707th Special Mission Group soldier and Kim Hyeon-Jun's best friend, with whom he is recruited into NSS. He also develops feelings for Choi Seung Hee, but later betrays Kim Hyeon-Jun during the Hung...

• Choi Seung Hee (played by Kim Tae-hee) — supporting

  A beautiful NSS agent who independently scouts Kim Hyeon-Jun and Jin Sa-Woo while concealing the recruitment process from them. She becomes Kim Hyeon-Jun's lover and tries to help him escape after his...

• Baek San (played by Kim Yeong-cheol) — supporting

  The director of NSS who receives Kim Hyeon-Jun and Jin Sa-Woo after they pass the simulated torture test. He explains that NSS is a secret organization responsible for preempting foreign threats, prot...

• Park Cheol-yeong (played by Kim Seung-woo) — cameo

Canonical Relationships

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

• Jin Sa-Woo → Choi Seung Hee (Unrequited Love) — Sa-Woo's persistent pursuit contrasts with Seung Hee's focus on Hyeon-Jun, creating emotional tension.

  "E1-E7: Sa-Woo pursues Seung Hee while she focuses on Hyeon-Jun. E12: Seung Hee becomes obsessed with finding Hyeon-Jun, sidelining Sa-Woo."

• Park Cheol-yeong → Jin Sa-Woo (Commander to Suspect) — A hierarchical relationship that fractures as leadership suspects Sa-Woo of betrayal.

  "E1-E13: Standard superior-subordinate dynamic. E14-E16: Park grows suspicious, orders arrest. E17: Sa-Woo imprisoned, trust broken."

• Jin Sa-Woo → Park Cheol-yeong (Loyal Subordinate to Traitor Suspect) — A professional bond that deteriorates into suspicion, ending with Sa-Woo's death in the line of duty.

  "E1-E13: Sa-Woo follows orders. E14-E16: Suspected of betrayal. E20: Dies in action, clearing name but ending service."

• Park Cheol-yeong → Choi Seung Hee (Commander to Doubting Agent) — A rigid superior-subordinate dynamic that fractures as loyalty is questioned and IRIS threats emerge.

  "E1-E13: Strict chain of command. E14: Park suspects her loyalty. E18: Seung Hee realizes she may be an IRIS target\/agent, shifting dynamic."

• Choi Seung Hee → Baek San (Colleagues to Suspects) — Professional colleagues whose relationship sours under treason allegations and IRIS investigations.

  "E1-E13: Co-workers in NSS. E14: Both suspected of traitorous activities. E19: Baek San arrested at IRIS base, Seung Hee investigates."

• Choi Seung Hee → Jin Sa-Woo (NSS Partners) — Operational partners whose professional dynamic weakens as personal obsessions and missions pull them apart.

  "E1-E7: Work together on missions. E7: Seung Hee follows Sa-Woo to Japan. E12: Professional distance grows as personal obsessions take over."

• Kim Hyeon-Jun → Baek San (Investigator to Target) — Hyeon-Jun transitions from investigating Baek San's alleged treason to capturing him at an IRIS facility.

  "E14: Baek San suspected of treason. E19: Hyeon-Jun tracks Baek San to IRIS base, leading to his arrest."

Story Dynamics

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

• Kim Hyeon-Jun → Choi Seung Hee (Protagonist & Key Ally) — The core narrative engine of the series, linking personal stakes to the larger terrorist conspiracy.

  "E1-E20: Central narrative thread. Their relationship drives the plot from romantic rivalry to cooperative survival against IRIS."

• Kim Hyeon-Jun → Jin Sa-Woo (Rivals to Reluctant Allies) — Evolve from professional rivals and romantic competitors to reluctant allies, culminating in Sa-Woo's sacrifice.

  "E1-E5: Competitive rivals over Seung Hee and professional standing. E9-E15: Reluctantly cooperate against IRIS. E20: Sa-Woo sacrifices himself for Hy...

• Kim Hyeon-Jun → Park Cheol-yeong (Strategic Partners) — A transactional partnership that evolves into a genuine alliance against a common terrorist threat.

  "E9-E11: Cheol-yeong aids Hyeon-Jun's revenge plot. E15-E17: Cheol-yeong defects to help Hyeon-Jun stop the nuclear attack."

• Jin Sa-Woo → Baek San (Co-Suspects) — Bound by mutual suspicion and imprisonment, their partnership is tested by treason allegations.

  "E14-E16: Both suspected of treason by NSS leadership. E16-E19: Arrested and imprisoned together, later found linked to IRIS operations."

Story Analysis

A single-season thriller tracking an agent's fall from grace, his fight against a shadowy terrorist network, and the tragic cost of loyalty.

Plot Progression

1. Season 1: Origins & Framing — Hyeon-Jun and Sa-Woo complete their first assignment, but Hyeon-Jun is framed as a spy, triggering a global manhunt and setting the stage for his rogue journey.
2. Season 1: Rogue Hunt & USB Revelation — Hunted across Japan and Hungary, Hyeon-Jun discovers a USB drive exposing IRIS, leading to a revenge pact with Cheol-yeong and a dangerous infiltration.
3. Season 1: Infiltration & Reunion — Hyeon-Jun uncovers Seung Hee's survival, endures a forced interrogation, and learns of IRIS's nuclear plot targeting Seoul during reunification.
4. Season 1: Treason & Defection — Sa-Woo and Baek San face treason suspicions while Cheol-yeong questions the nuclear attack, ultimately defecting to join Hyeon-Jun's counter-offensive.
5. Season 1: Final Assault & Aftermath — The nuclear threat is averted, Sa-Woo dies in action, and the team uncovers an IRIS deception, leaving the war against the shadow organization unresolved.