Park Chang Ho (Lee Jong Suk), in 'Big Mouth' episode 9, correctly predicts the prosecution's case against the VIPs.
It begins to become clear who Mayor Choi Do Ha (Kim Joo Hun) really is.
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 Unintentionally Shares Information Regarding Professor Seo's Death.
Park Chang Ho went back to prison after his brilliant scheme to expose the truth about the VIPs was successful.
It was also discovered that the mayor has a concealed location where he keeps blocks of cash and gold.
Additionally, Mayor was the brains behind the car accident that occurred when the VIPs were discovered concealing Seo Jae Young's dead body in the trunk of the vehicle.
This offered viewers a hint that the mayor is Big Mouse, the infamous con artist.
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