People being hacked since the last Server Check.

I just refuse to believe hacks until I see it for my eyes.

That's an absolutely absurd way to go about life.
People's accounts have been compromised, and you are basically saying that you believe all of us to be liars.

I'm in the same boat as you. If these hackings are true one question for everyone. Have you played DFO recently. NEXON has stated if you play or have played DFO there was a breach there.

A breach would only be the result of hacking.
If you believe in the breach, you must believe these hackings are "true".

My brother played DFO, but only for the crossover event they had months ago.
He played for less than an hour (not that that's relevant other to demonstrated that he was not a regular player).

I think Nexon's login server got attacked or the database is somehow leaked out after the login server maintenance (thinking of Edison Chan's photos case).
...
The timing on login server downtime is pretty much match on the hack reported time, all hack reports are happened after the login server downtime.

This is the conclusion I came to as well.

I also found it disturbing that, as the servers came back up, some people were actually about to login to their characters without entering a PIC.
That tells me that the PIC can, in fact, be bypassed.

Then I should not be the first wave of victims, I am not known for good damage or rich. And I am not that high level as well... Only level 178.

I don't think there's a true pattern to the hack as some people have reported their mule accounts getting hacked while their mains are so-far untouched.

One this is for sure:
The hackers don't to seem to have any real knowledge of the game economics.
They also are intent on making money with as few transactions as possible.