Yoo Seong-a: The Frog character explained

In The Frog, Yoo Seong-a, played by Go Min-si, is the lead antagonist who refuses to leave Yeong-ha’s house.

Yoo Seong-a is an artist from a wealthy family. However, her father does not like her paintings, believing that people only buy them because of his influence. 

Seong-a ends up marrying Jae-sik but does not find happiness with him either. Although Jae-sik’s son, Si-hyeon, loves Seong-a, she does not want him in her life. 

She constantly doubts whether Jae-sik married her out of love or simply to provide a mother for his son. Her insecurities eventually lead her to commit a heinous crime.

Killing an innocent child

Seong-a falsely accuses Jae-sik of domestic abuse, resulting in him going to prison. She then decides to test whether Jae-sik would have married her if he did not have Si-hyeon. 

To do that, she rents Yong-chae’s vacation home in the countryside, where she plans to kill Si-hyeon, the child she never loved. Yong-chae’s air conditioner breaks down, so he arranges for her to stay at Yeong-ha’s house instead. 

That night, Seong-a kills Si-hyeon, dismembers his body, and meticulously cleans Yeong-ha’s bathroom to eliminate any traces.

She leaves early the next morning and gives Jae-sik the body of another child, claiming that Si-hyeon died in an accident.

Months later, she returns to rent Yeong-ha’s house, having become attached to the place after committing murder there. Yeong-ha reluctantly allows her to stay. 

As Yeong-ha pretends not to recognize her, Seong-a realizes that he suspects her. Her suspicions are confirmed when he eventually confronts her about Si-hyeon’s death.

She discovers that Yeong-ha has dashcam footage showing her leaving the house without Si-hyeon and that he had destroyed all other evidence against her. 

Seong-a then starts taking advantage of the fact that Yeong-ha covered up her crime. She torments him relentlessly, fully aware that he cannot go to the police no matter what she does.

Seong-a’s brutality and unchecked violence

Seong-a wishes to buy Yeong-ha’s house and starts making changes to it without his consent. When Yeong-ha can no longer tolerate her behavior, he decides to go to the police with the dashcam footage and a recorded confession. 

He is prepared to face the consequences of covering up Seong-a’s crime, but Seong-a hits him with her car to stop him from taking the evidence to the police. 

She steals the evidence, leaving Yeong-ha with no leverage against her. This marks the beginning of a psychological war between them over the ownership of the house.

Seong-a even involves Officer Kim but kills him the moment he finds the evidence she had stolen from Yeong-ha. A desperate Yeong-ha then agrees to sell her the house but disappears for a while. 

The Frog Yoo Seong-a
Seong-a kills Officer Kim

During his absence, Yong-chae comes to visit and is stabbed by Seong-a when he threatens to call the police on her. Seong-a keeps him locked in the basement.

To force Yeong-ha to return, Seong-a kidnaps his pregnant daughter, Ui-seon, drugs and injures her, and keeps her locked in a bag. 

She only releases Ui-seon when Yeong-ha returns and agrees to help her bury Officer Kim’s body, unaware that Yeong-ha is now working with the police.

This leads to Seong-a’s arrest, but the police cannot keep her in custody for long, as there is no solid evidence against her. In fact, she appears to be a victim of domestic abuse and mental illness. 

Once released, she continues to ruin lives. Her father, realizing that his daughter is a murderer who cannot be controlled, asks Jae-sik to kill her to prevent further damage to his reputation. 

Seong-a is then killed by Jae-sik. The police also find Officer Kim’s body, which provides concrete evidence that Seong-a is a murderer. Ultimately, she faces justice for her crimes, but not before inflicting pain on many others.


Also Read: The Frog recap and ending explained

Muskan Chhatwani
Muskan Chhatwani
Muskan is an editor at The Envoy Web. Her name translates to smile in English, but she likes shows and films that do anything but make you smile. She believes that analyzing and interpreting the tiny little things on-screen can reveal a story that is not visible to everyone, a story of your own.

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