Character Relationship Map: Luck-Key

Characters

• Hyung-wook (played by Yoo Hai-jin) — protagonist

  A notorious assassin who suffers amnesia after a slip-and-fall accident and assumes the identity of an aspiring actor. He works at a restaurant, excels in action scenes for a TV show, and eventually r...

• Yoon Jae-sung (played by Lee Joon) — protagonist

  A down-on-his-luck aspiring actor who accidentally switches identities with an assassin. He enjoys the assassin's wealth, discovers a secret room, and falls in love with a neighbor he protects. He ult...

• Ri-na (played by Jo Yoon-hee) — supporting

  A paramedic who helps the amnesiac assassin pay his hospital bills and secures him a job at her mother's restaurant. She supports his acting career, develops romantic feelings for him, and witnesses h...

• Song Eun-joo (played by Lim Ji-yeon) — supporting

  A woman living in the same building who is initially believed to be a protected witness. She becomes the object of Jae-sung's affection, learns the truth about the fake assassinations, and joins the m...

• Ri-na's Mother (played by Seong Byeong-suk) — supporting

Canonical Relationships

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

• Ri-na's Mother → Ri-na (mother)
• Yoon Jae-sung → Song Eun-joo (Romantic Interest) — Jae-sung grows romantically attached to Eun-joo while protecting her.

  Jae-sung believes Eun-joo is a witness being protected, watches over her, and falls in love with her.

Story Dynamics

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

• Hyung-wook → Song Eun-joo (Alliance Partners In A New-Life Plan) — Hyung-wook and Eun-joo cooperate in a plan to escape their former circumstances.

  After Hyung-wook explains that he fakes assassination victims' deaths to give them new lives, Hyung-wook, Jae-sung, and Eun-joo devise a plan together...

• Hyung-wook → Yoon Jae-sung (Alliance Identity-Swap Accomplices) — An accidental identity exchange develops into a cooperative partnership.

  After Hyung-wook loses his memory and assumes he is Jae-sung, Jae-sung eventually learns the truth about Hyung-wook's work. They devise a plan togethe...

Story Analysis

An accidental identity exchange brings two struggling lives together, exposing a hidden scheme that offers a chance to start over.

Plot Progression

1. The Locker-Key Exchange — Jae-sung and Hyung-wook meet at a sauna, where an accidental fall leaves Hyung-wook unconscious. Jae-sung switches their locker keys and takes Hyung-wook's belongings, setting an identity exchange in...
2. Two Lives Reversed — Hyung-wook awakens with amnesia and assumes Jae-sung's identity, while Jae-sung enjoys the apartment and money he has taken. Hyung-wook struggles financially, finds restaurant work, and discovers a ro...
3. The Witness and the Secret — Hyung-wook's practical skills help him succeed in television action scenes. Meanwhile, Jae-sung discovers a secret room, watches over Eun-joo, and learns that Hyung-wook was hired to kill her.
4. A Dangerous New Beginning — Hyung-wook recovers his memory and reveals that he has been faking victims' deaths to give them new lives. He, Jae-sung, and Eun-joo stage their own deaths, and the story closes with a fresh start in...