In "Big Mouth" episode 9, Park Chang Ho (Lee Jong Suk) predicts the prosecution's evidence against the VIPs correctly. Meanwhile, the hidden truth about Mayor Choi Do Ha's (Kim Joo Hun) real identity starts to unfold.
'Big Mouth' Episode 9: Park Chang Ho Predicts VIPs' Trial Correctly
Park Chang Ho (Lee Jong Suk) appeared on the News Mental channel and predicted the prosecution's evidence against the VIPs correctly, making the public believe that everything was already done accordingly for the VIPs to win the case.
Thanks to Go Mi Ho's (Yoona) help, she posed as a commenter and gave them updates on what was happening in court. Gong Ji Hoon (Yang Kyung Won) found out what Park Chang Ho was up to and immediately asked his people to catch him.
Gong Ji Hoon then received a call from Jang Hye Jin, who demanded divorce papers in exchange for Professor Seo's paper. He agreed and met Han Jae Ho's wife in a cafe and asked for Big Mouse's hideout.
She said the location, but the police failed to see him there. Ji Hoon and Hye Jin exchanged divorce papers and data cards. Meanwhile, the court found the VIPs not guilty due to insufficient evidence, which Park Chang Ho predicted.
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The self-proclaimed Big Mouse also used it as an opportunity to mention Professor Seo's paper.
Gong Ji Hoon Accidentally Admits Something About Professor Seo's Death
After the trial, a truck rolled up with a large screen and showed the video with Park Chang Ho. The screen switched to a hidden camera in the cafe where Ji Hoon got angry at Hye Jin for giving him the wrong document, instead of Professor Seo's.
There, he revealed that the VIPs killed Seo.
The truck slowly opened, and Park Chang Ho appeared clad in suit and sitting comfortably in a high chair.
Park Chang Ho Returns To Jail
After his genius plan in revealing the truth about the VIPs, Park Chang Ho returned to jail. His cellmates, including Yang Chun Sik's (Song Kyung Cheol) gang, celebrated Chang Ho's success.
No Park (Yang Hyuk Wook) mentioned the ghostly disease spreading inside the prison. Inmates seemed to cough up blood and later on became violent.
Chairman Yang said that the same thing already happened before, but prisons got suddenly cured.
Mayor Choi Do Ha's Secrets Are Out!
Based on the flashback, Choi Do Ha and Jang Hye Jin already had a deal before Go Mi Ho had gotten involved. He used his power to manipulate Hye Jin, and as desperate as she was to survive, she negotiated with Do Ha and gave the copy of Seo Jae Young's document.
It was then revealed that the mayor has a secret place where blocks of money and gold are hidden. He was also the mastermind behind the car accident when the VIPs got caught hiding Seo Jae Young's dead body in the trunk of the car.
This gave the viewers a hint that the mayor is the notorious swindler, Big Mouse.
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Shai Collins wrote this.