First of all, Juan is definitely not as simple as a prison guard who just took office. He should be an insider dispatched by the prison and ready to mix in the prison. The purpose may be to keep the three terrorist hostages from harm (or be ready to sacrifice the three of them at any time) . Originally, he was going to officially infiltrate on the 1st. When he went to the prison one day in advance to check the situation, there was a riot. This riot was indeed an accident, and Room 211 should have been prepared for him.
It can be seen from the dialogue between the colleague prison guard and him that the bearded colleague prison guard knew his identity and purpose, so he warned him to "know where you are, don't trust anyone, don't let them see The fear in your eyes", if Juan is just a simple prison guard, why should he not trust anyone? Have you ever seen a prison guard trust a prisoner? So he must know Juan's identity. But the government may not know about the prison's practice, so the person sent by the government is kept in the dark, thinking that he is a simple prison guard. And since he mentioned that his colleague is gay, it is possible that he still has a special personal feeling for Juan in it.
Another Juan, when he learned of the prison riot and he was going to enter the role ahead of time, was too calm from his series of actions to hide his clothes, and he didn't look like someone who didn't understand the prison situation at all.
It feels like a mystery as to whether Juan's wife actually died in the end...
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