Character Relationship Map: A Day

Characters

• Jun-young (played by Kim Myung-min) — protagonist

  Jun-young is a doctor and the central protagonist. After his daughter dies in a car accident, he repeatedly awakens on the previous day and desperately tries to prevent the fatal event. His investigat...

• Min-chul (played by Byun Yo-han) — supporting

  Min-chul is the husband of the woman who dies in the same accident as Jun-young’s daughter. Like Jun-young, he experiences the same day repeatedly and works to save his loved one. His shared time loop...

• Kang-sik (played by You Chea-myung) — supporting

  Kang-sik is connected to the child whose heart was transplanted without the father’s consent. His grief and anger become part of the revenge behind the repeated deaths, forcing Jun-young and Min-chul...

• Mi-kyung (played by Shin Hye-sun) — supporting

  Mi-kyung is the woman who dies in the car accident alongside Jun-young’s daughter. Her death makes her husband part of the repeating day and links his fate to Jun-young’s efforts to change the acciden...

Canonical Relationships

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

• Min-chul → Mi-kyung (Family Husband) — Min-chul repeatedly tries to find and save Mi-kyung after the accident makes her fate part of the repeating day.

  The character profile identifies Min-chul as the husband of the woman who dies in the same accident as Jun-young’s daughter; the plot names that woman...

Story Dynamics

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

• Min-chul → Kang-sik (Grief-Fueled Conflict) — Min-chul's grief escalates into violence against Kang-sik, whom he holds responsible for Ha-roo's loss.

  The plot says Min-chul turns on Kang-sik and blames him for the loss of Ha-roo.

• Jun-young → Min-chul (Alliance Uneasy Allies) — They cooperate to understand the cycle and prevent the deaths, despite the pressure and grief surrounding them.

  The plot says both men experience the repeating day and struggle together to change what happened.

Story Analysis

A doctor trapped in a repeating day tries to prevent connected deaths and ultimately risks himself to save someone.

Plot Progression

1. A Promise Delayed — Jun-young returns to Seoul and struggles with his strained relationship with his daughter. After promising to meet her, he stops to help a choking boy and learns she has been in a fatal accident.
2. The Day Repeats — The morning of May 17 begins again, and Jun-young repeatedly tries to prevent the tragedy. He discovers that Min-chul is also trapped in the cycle.
3. The Accident's Wider Cost — The men uncover connections involving an orange taxi, Mi-kyung's pregnancy, and Kang-sik's critical injuries. An organ donation decision deepens the crisis surrounding the repeated events.
4. Blame and Violence — Min-chul blames Kang-sik for Ha-roo's loss and turns against him. Jun-young tries to stop the violence while still attempting to save Mi-kyung.
5. A Risk at the Intersection — Jun-young reaches his daughter and comforts her before hurrying toward an intersection. He puts himself in danger to save someone, leaving the outcome uncertain.