Character Relationship Map: Tidal Wave

Characters

• Gang Yeon-heui (played by Ha Ji-won) — protagonist

  The owner of an unlicensed seafood restaurant who wants a relationship with Man-shik. She uses a red ribbon to signal whether she accepts his proposal and survives the tsunami.

• Kim Hwi (played by Park Joong-hoon) — supporting

  A geologist who recognizes that the sea is showing signs similar to the earlier tsunami. After warnings are dismissed, he calculates that Busan has only minutes to evacuate, helps Ji-min reach a rescu...

• Choi Hyeong-sik (played by Lee Min-ki) — supporting

  A lifeguard who rescues Hee-mee after she falls from a yacht. During the tsunami rescue, he sacrifices himself by cutting the rope so that another person can reach the helicopter.

• Helicopter Pilot (played by Lee Briggs) — minor
• Yeon-heui's Father (played by Do Yong-gu) — minor

  He dies aboard a deep-sea fishing boat during the 2004 tsunami after an error in judgment. His death becomes the source of Man-shik's guilt and shapes his relationship with Yeon-heui.

• Choi's Uncle (played by Song Jae-ho) — supporting

  A former shipowner who allowed Man-shik and Yeon-heui's father to sail during the earlier tsunami. Later serving as Busan's head chairman, he promotes Haeundae redevelopment and ultimately sacrifices...

• Oh Dong-chun (played by Kim In-kwon) — supporting

  Man-shik's half-brother who engages in illegal activity with his son to earn money. He reveals the truth about Yeon-heui's father's death, fights with Man-shik, survives the tsunami, and later breaks...

• Dong-chun's mother (played by Seong Byeong-suk) — supporting

  She attempts to escape through the streets as the tsunami approaches and later dies in the disaster. Her death causes Dong-chun to break down in tears.

• Ji-min (played by Kim Yoo-jung) — supporting

  Yu-jin's daughter, who is unaware that Hwi is her biological father. During the disaster, she communicates with her mother, reaches the roof, and is helped onto a rescue helicopter before her parents...

Canonical Relationships

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

• Yeon-heui's Father → Gang Yeon-heui (father)
• Dong-chun's mother → Oh Dong-chun (mother)
• Choi Hyeong-sik → Helicopter Pilot (Professional Rescue Team Member) — Choi Hyeong-sik depends on the helicopter rescue operation while attempting to save people in the water.

  Choi Hyeong-sik jumps from a rescue helicopter and later remains connected to the helicopter by a rope during the sea rescue.

• Choi's Uncle → Yeon-heui's Father (Professional Shipowner) — Choi's Uncle held responsibility for the fishing voyage connected to Yeon-heui's Father's death.

  The plot states that Choi's Uncle was the shipowner who allowed Yeon-heui's Father and Man-sik to sail during the tsunami years earlier.

• Kim Hwi → Ji-min (Family Biological Father) — Their concealed biological relationship becomes emotionally central during the disaster.

  Kim Hwi eventually reveals to Ji-min that he is her biological father before she boards the rescue helicopter.

Story Dynamics

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

• Kim Hwi → Yeon-heui's Father (Narrative Disaster Predecessor) — Yeon-heui's Father's earlier death provides a precedent for Kim Hwi's tsunami warning.

  Kim Hwi compares the Sea of Japan's activity with what was observed in the Indian Ocean five years earlier, the disaster linked to Yeon-heui's Father'...

• Choi's Uncle → Dong-chun's mother (Alliance Fellow Survivor) — They share the same escape situation during the tsunami's arrival.

  Choi's Uncle and Dong-chun's mother are both in the streets attempting to escape when they see the approaching wave.

• Ji-min → Helicopter Pilot (Narrative Rescue Evacuee) — Ji-min's survival depends on the helicopter evacuation.

  Ji-min is helped onto a crowded rescue helicopter by Kim Hwi and Yoo-jin before the helicopter leaves.

• Kim Hwi → Helicopter Pilot (Alliance Rescue Coordinator) — Kim Hwi's final actions support the helicopter evacuation led by the pilot.

  Kim Hwi helps Ji-min board a crowded rescue helicopter after reaching the roof with her and Yoo-jin.

• Kim Hwi → Choi Hyeong-sik (Alliance Emergency Collaborator) — Both contribute to rescue efforts during the tsunami, although their actions occur in different rescue operations.

  Kim Hwi helps Ji-min reach a crowded rescue helicopter while Choi Hyeong-sik performs a separate helicopter rescue at sea during the same catastrophe.

Story Analysis

A coastal community confronts a catastrophic tsunami while personal guilt, hidden family bonds, sacrifice, and reconstruction shape its survival.

Plot Progression

1. Old Disaster, New Lives — The earlier Indian Ocean disaster establishes the emotional and moral history surrounding the coastal community. Busan residents continue their lives while redevelopment tensions and concealed family...
2. Warnings Beneath The Sea — Kim Hwi recognizes geological activity resembling the earlier tsunami. Officials reject his concern, but the developing megatsunami confirms that the danger is real.
3. Ten Minutes To Escape — Kim Hwi calculates the short evacuation window as the sea recedes and panic spreads through Busan. The wave reaches Haeundae and turns the city into a disaster zone.
4. Sacrifices In The Flood — Flooding, electrocution, and the bridge explosion intensify the catastrophe. Choi's Uncle sacrifices himself, while the helicopter rescue creates another life-or-death choice.
5. Ruins And Remembrance — Kim Hwi reveals the truth to Ji-min before the final wave kills him and others. Memorials and reconstruction leave Busan devastated but emotionally hopeful.