I guess after Penthouse 1 and Penthouse 2, the audience is so used to tons of unexplainable plot twists, we are not even surprised anymore when the same happens in Penthouse 3. Every single time a character dies (especially important characters), I can't help but think "how is he/she going to come back later?" I think we can summarise the series with three points

1) The rich will never run out of money. Even when nearing bankruptcy, there's always a way to bounce back to the same wealth as before.
2) The more evil the person is, the longer life he'll live.
3) No matter how deadly the encounter is, there is still a way to come out alive and look better than before.

After conditioning us to think that anything is possible, you would think there would somehow be a happy ending as an answer to all the efforts that were done in the previous two seasons, until the screenwriter decides that it doesn't make sense to do the same trick twice (or multiple times) and give us one of the weirdest endings (in my opinion).

To be honest, I kind of feel cheated. After following this drama for so long, watching each character's ups and downs, the ending really made me feel like I've wasted my time. On one hand, it has been a great journey. It is kind of nice to see the dramatic lives of the rich once in a while, but on the other hand, the ending is very underwhelming.