It is perfectly okay to break the fourth wall. I am not familiar with the example you're referring to, but I can try to give a few tips:
1- The storyteller. These usually address the reader directly like, well, a storyteller.
2- The crazy narrator who has no idea the fourth wall even exists and directly addresses the reader at every opportunity.
3- The lean. This is when the characters don't really address the reader directly, but more acknowledge they're in a work of fiction.
I have seen all forms done well. The main thing to keep in mind is consistency, because pulling out a sudden fourth wall break can be really jarring. Leaning can be done without much of a prerequisite, because it is just a lean that can be more easily worked into a piece compared to a full on break.
TV Tropes has more information on this, along with a ton of examples, but I hesitate linking you to that site because it is highly addictive.
A writer is a world trapped in a person— Victor Hugo
Ink is blood. Paper is bandages. The wounded press books to their heart to know they're not alone.
If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them. — Henry David Thoreau, "Walden"
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