Yoon Jung-won, Chae-ok’s father, has been looking for his missing wife for a decade now. In Gyeongseong Creature, Jo Han-chul plays Jung-won.
Jung-won is a sleuth whose wife, Seong-sim or Seishin, went missing 10 years ago. Jung-won is still looking for her with his daughter.
While looking for Seishin, Jung-won and Chae-ok keep taking missing person cases to make money, and they are quite good at what they do.
Trusting Tae-sang
When Jung-won and Chae-ok come to know that Sachimoto had met Seishin and is living in Gyeongseong, they come to Gyeongseong, where they meet Tae-sang.
Tae-sang is willing to help them locate Sachimoto if they agree to find Myeong-ja for him.
As Chae-ok is reluctant to make a deal with Tae-sang, Jung-won asks Tae-sang whether he is a good man or not, and Tae-sang replies that he is a man who wants to survive.
Jung-won determines that Tae-sang is a good person and decides to trust him, even though his daughter does not agree with his decision.
At the hospital, when Tae-sang risks his all to save the other prisoners, Jung-won realizes that he was right about Tae-sang being trustworthy.
He knew that when the time came, Tae-sang would do right by their people, despite Tae-sang claiming otherwise.
Discovering the truth
After successfully leaving the hospital, Jung-won wishes to return home with Chae-ok, as they have completed their task of finding Myeong-ja.
Chae-ok then tells her father that she found Seishin. Jung-won does not feel relieved to know that his wife is alive when he is told what happened to her.
Jung-won comes to know that Seishin was subjected to experiments and has been turned into a monster. He had encountered her but failed to recognize her.
The news devastates him, and Jung-won decides to go back to the hospital to be with his wife. He leaves behind a letter to inform his daughter of the same.
Kato takes Jung-won to see Seishin, and Jung-won is heartbroken and angry to see that his wife has turned into a monstrous creature that kills humans without hesitation.
Last wishes
After seeing his wife, Jung-won is captured by the soldiers and kept in a prison cell, but it does not take him long to escape.
He then runs into Tae-sang, who tells him about his plan to blow up the hospital. Tae-sang also informs him that Chae-ok was brought back to the hospital.
Tae-sang gives Jung-won two tickets to Shanghai and asks him to take Chae-ok there once she is recused. However, Jung-won has other plans.
All these years, Jung-won has been living in the past. Due to that, Chae-ok could not move on either. Jung-won wanted Chae-ok to live her own life after completing this one last mission.
Now that their search has come to an end, Jung-won believes that Chae-ok can finally have a future with Tae-sang. He wants Tae-sang to protect Chae-ok.
Jung-won sends Tae-sang to save Chae-ok and takes it upon himself to blow up the hospital. He plants dynamite everywhere and lures Seishin out.
He tells his wife that he missed her. He wants to leave the world with her, but Jung-won’s wish does not come true. While Jung-won dies in the explosion, Seishin escapes.
Also Read: Myeong-ja/Akiko: Gyeongseong Creature character explained