![](https://i.mydramalist.com/BdpXkz_4t.jpg)
![](https://i.mydramalist.com/Ee5EO_4t.jpg)
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Both movies have a cop undercover in a prison as the main character.
The Prison takes place almost fully in a prison while The Merciless skips around a lot.
The Merciless is definitely darker but it has a really good plot that makes you never know what is going to happen next.
Both are great movies.
The Prison takes place almost fully in a prison while The Merciless skips around a lot.
The Merciless is definitely darker but it has a really good plot that makes you never know what is going to happen next.
Both are great movies.