Character Relationship Map: Last Child

Characters

• Mi-sook (played by Kim Yeo-jin) — supporting

  Mi-sook is Eun-chan’s mother and Seong-cheol’s wife. She is deeply affected by her son’s death and feels intensely uncomfortable when Ki-hyeon enters their home and workplace. Unlike her husband, she...

• Ki-hyeon (played by Sung Yoo-bin) — supporting

  Ki-hyeon is the boy Eun-chan saved before Eun-chan died, and he later becomes an apprentice in Seong-cheol’s interior-design business. He learns wallpapering, earns a craftsman’s licence, and receives...

• Jun-young (played by Park Chan) — supporting

  Jun-young had been Eun-chan’s friend and becomes connected to the reopened investigation into Eun-chan’s death. Ki-hyeon confronts him about what happened, but Jun-young denies the accusation. He is l...

• Jun-young's Mother (played by Kim Do-young) — supporting
• Eun-chan (played by David Lee) — supporting

  Eun-chan is the boy whose death in a river accident drives the story and leaves his parents struggling with grief. He saved Ki-hyeon’s life, prompting Seong-cheol to help Ki-hyeon after his death. The...

Canonical Relationships

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

• Jun-young's Mother → Jun-young (mother)
• Mi-sook → Eun-chan (Family Mother) — Mi-sook grieves Eun-chan's death and is deeply uncomfortable when Ki-hyeon enters the family’s life.

  The plot describes Mi-sook and her husband as Eun-chan's parents and shows them struggling after his death.

Story Dynamics

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

• Mi-sook → Ki-hyeon (Conflict Grieving Parent And Suspected Assailant) — Mi-sook struggles with Ki-hyeon’s presence in the household while her husband argues that Ki-hyeon was not to blame and offers him work.

  Mi-sook sees Ki-hyeon as connected to Eun-chan’s death and is deeply uncomfortable with his presence.

• Ki-hyeon → Jun-young (Conflict Accuser And Denier) — Their confrontation reflects the dispute over Eun-chan’s death; the later investigation reveals that Ki-hyeon gives an account different from the boys’ shared description of an accidental drowning.

  Ki-hyeon confronts Jun-young over what happened to Eun-chan, and Jun-young denies the accusation.

• Jun-young → Eun-chan (Social Friend) — Jun-young’s connection to Eun-chan becomes relevant when Ki-hyeon confronts him about what happened.

  The plot identifies Jun-young as someone who had been Eun-chan’s friend.

• Ki-hyeon → Eun-chan (Conflict Former Victim And Assailant) — Eun-chan saved Ki-hyeon, but Ki-hyeon later admits he took part in the assault that preceded Eun-chan’s death and helped cover it up.

  Ki-hyeon first says Eun-chan drowned while trying to save him, but later admits that he and the others assaulted Eun-chan and that he pressured them t...

Story Analysis

A grieving family’s effort to help Ki-hyeon unfolds alongside the unresolved truth about Eun-chan’s death.

Plot Progression

1. Grief and Unanswered Questions — After Eun-chan dies, his parents face grief and uncertainty. His father prepares a scholarship foundation in his name and asks about Ki-hyeon, who has not returned to school.
2. A Place to Begin Again — Ki-hyeon has little support and no clear work prospects. Eun-chan’s father offers him an apprenticeship, though Mi-sook is troubled by his presence and connection to the death.
3. Work and Hard-Won Progress — Ki-hyeon learns wallpapering and studies for a craftsman’s licence. He passes, earns a promotion, and receives an offer of full-time work.
4. Suspicion Returns — Jun-young comes under suspicion, and Ki-hyeon confronts him about Eun-chan. Months later, the case is reopened and the boys are questioned again.
5. A Confession Without Closure — Ki-hyeon gives an account that contradicts the accidental-drowning story, admitting to the assault and cover-up. A detective reports the admission, but the transcript ends before the investigation’s o...