Character Relationship Map: Loner

Characters

• Jeong Soo-na (played by Go Eun-ah) — protagonist

  A 17-year-old high school student living with her uncle and grandmother, Soo-na becomes agoraphobic after her best friend’s suicide. As disturbing events unfold at home, she later admits that she allo...

• Choi Yoon-mi (played by Chae Min-seo) — supporting

  Se-jin’s fiancée, Yoon-mi becomes concerned when Soo-na recounts a story suggesting that Se-jin and Song-i had a daughter together. She presses Se-jin for an explanation and investigates the family co...

• Grandmother (played by Jung Young-sook) — supporting

  Soo-na’s grandmother lives with her and Se-jin in the family mansion. She tries to keep Song-i away from Soo-na and later attempts to reach Soo-na’s room by ladder. Soo-na kicks the ladder, breaking h...

• Han Song-i (played by Lee Yeon-su) — supporting

  Song-i is Se-jin’s former lover and, as the story reveals, Soo-na’s mother. She married another man after Se-jin left, and the account suggests that her husband abused her. She reconnects with Se-jin...

Canonical Relationships

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

• Han Song-i → Jeong Soo-na (Family Mother) — Their concealed mother-daughter relationship shapes the family revelations and supernatural imagery.

  Soo-na's trance-like story implies that Han Song-i is her mother. Later, Soo-na observes Han Song-i's spirit after Song-i's death.

• Jeong Soo-na → Grandmother (Family Grandmother) — They are members of the same household, but their relationship deteriorates into deadly violence.

  Jeong Soo-na lives with her grandmother in the mansion. Later, Grandmother attempts to reach Soo-na's room and is fatally attacked after Soo-na kicks...

Story Dynamics

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

• Choi Yoon-mi → Han Song-i (Narrative Revelation Link) — Yoon-mi's discovery exposes the concealed relationship between Song-i and the household.

  Yoon-mi learns that the family has another daughter living with Han Song-i, connecting her investigation to Song-i's hidden family history.

• Grandmother → Han Song-i (Conflict Antagonistic Gatekeeper) — Grandmother actively blocks Song-i's access to Soo-na and uses violence against her.

  When Han Song-i meets with the family's former lover, Grandmother follows and beats her, refusing to let her see Soo-na.

• Jeong Soo-na → Choi Yoon-mi (Social Household Acquaintance) — Yoon-mi becomes connected to Soo-na through the household and the revelations surrounding her family.

  Choi Yoon-mi is present at dinner in the mansion and listens while Soo-na recounts a story about her family origins.

Story Analysis

A traumatized girl retreats into isolation as buried family secrets, violence, and guilt transform the mansion into a psychological nightmare.

Plot Progression

1. A House After The Deaths — A public prank leads to suicide and a second suicide, leaving Soo-na psychologically devastated. Her withdrawal turns the mansion into a closed and unstable environment.
2. Secrets At The Dinner Table — Song-i's return provokes violence from Grandmother and exposes old family tensions. Soo-na's story at dinner suggests hidden parentage and an abandoned romance.
3. Vermin In The Mansion — Soo-na's condition becomes visibly horrifying as vermin appear on her body. The maid disappears into a barrel, Grandmother is crippled, and the house becomes deadly.
4. The Dead Mother's Return — Song-i is found dead on the railway, while her former lover explains why he abandoned her. Soo-na then observes Song-i's spirit and Yoon-mi uncovers another daughter.
5. The Daughter Behind The Mask — A suicide attempt leads to the discovery that the apparent Soo-na is someone else. After the imposter dies, Soo-na confesses and the hidden perpetrator is identified.