Big Mouth (2022) [-]
Sep 03 2025
Big Mouth is a South Korean crime/politics drama running the standard 16 episodes each about 70 minutes long.
Park Chang-ho (Lee Jong-suk, male lead in While You Were Sleeping (2017)) is a struggling lawyer unflatteringly nicknamed "Big Mouth" because he's all big talk while losing 90% of his cases. He's hired by city mayor Choi Do-ha (Kim Joo-hun) to prosecute three people accused of murder. On the surface Park is supposed to follow a script and lose as mayor Choi is working for the three. But mayor Choi also wants leverage so if Park finds a certain piece of evidence he's to turn it over to mayor Choi.
Park does find the video recording proving the murder (though not who the big boss is) but then he tries to curry favor with the three's boss Gong Ji-hoon (Yang Kyung-won, notable supporting roles in Crash Landing on You (2019) and Welcome to Samdal-ri (2023)) who is like second or third in his family's conglomerate that effectively runs the city. Gong doesn't like a no name lawyer trying to blackmail him so Park gets into an accident (where he loses the evidence), drugs are found in his office, and he is convicted and sent to prison.
Half the series is Park being in prison trying to survive by taking on the persona of Big Mouse, a secret con man who stole 100B won from Gong Ji-hoon. Big Mouse is subtly helping Park and Park's plan is to both bring out Big Mouse into the light and make sure the bad guys face justice. Meanwhile his wife Ko Mi-ho (Im Yoon-ah, supporting actress in The K2 (2016) and here she has a much bigger role even though I only mention her now)…
This is a series with lots of plot twists as there are multiple agents working at cross purposes through Park Chang-ho. It's really interesting around episodes four to twelve but much less at the beginning and end. I found the ending a bit lazy. The big bad thwarts Park's plans and has decidedly won but then Park kills him, in an ironic way but still he could have been murdered at any time so doing it at the end is kind of admitting defeat. Also there's another sad plot point which didn't seem necessary — maybe could have been if the final court case where it was used it helped bring a conviction of the big bad but it didn't so seemed like a wasted way to kill of a secondary character.
Production is good, acting is good, plot twists make it interesting for a while but get old as the series goes on. I wouldn't recommend this series — even though it's often good I think the last quarter of the series if fairly disappointing.
Park Chang-ho (Lee Jong-suk, male lead in While You Were Sleeping (2017)) is a struggling lawyer unflatteringly nicknamed "Big Mouth" because he's all big talk while losing 90% of his cases. He's hired by city mayor Choi Do-ha (Kim Joo-hun) to prosecute three people accused of murder. On the surface Park is supposed to follow a script and lose as mayor Choi is working for the three. But mayor Choi also wants leverage so if Park finds a certain piece of evidence he's to turn it over to mayor Choi.
Park does find the video recording proving the murder (though not who the big boss is) but then he tries to curry favor with the three's boss Gong Ji-hoon (Yang Kyung-won, notable supporting roles in Crash Landing on You (2019) and Welcome to Samdal-ri (2023)) who is like second or third in his family's conglomerate that effectively runs the city. Gong doesn't like a no name lawyer trying to blackmail him so Park gets into an accident (where he loses the evidence), drugs are found in his office, and he is convicted and sent to prison.
Half the series is Park being in prison trying to survive by taking on the persona of Big Mouse, a secret con man who stole 100B won from Gong Ji-hoon. Big Mouse is subtly helping Park and Park's plan is to both bring out Big Mouse into the light and make sure the bad guys face justice. Meanwhile his wife Ko Mi-ho (Im Yoon-ah, supporting actress in The K2 (2016) and here she has a much bigger role even though I only mention her now)…
This is a series with lots of plot twists as there are multiple agents working at cross purposes through Park Chang-ho. It's really interesting around episodes four to twelve but much less at the beginning and end. I found the ending a bit lazy. The big bad thwarts Park's plans and has decidedly won but then Park kills him, in an ironic way but still he could have been murdered at any time so doing it at the end is kind of admitting defeat. Also there's another sad plot point which didn't seem necessary — maybe could have been if the final court case where it was used it helped bring a conviction of the big bad but it didn't so seemed like a wasted way to kill of a secondary character.
Production is good, acting is good, plot twists make it interesting for a while but get old as the series goes on. I wouldn't recommend this series — even though it's often good I think the last quarter of the series if fairly disappointing.