According to the website, the maintenance is finished (http://onigiri.cyberstep.com/info/topic/maintenance/19522).
However, when trying to start the game, the launcher and the client update, then the login screen states:
'ERR_01007
Currently in Maintenance'.

As I said in a previous post, fire your amateur IT staff and hire actual professionals...

Update:
Trying again a bit over 30 minutes later, still '... in Maintenance'.
My educated guess is that those nincompoops left the server on a 4 or 5 hours timer to get back online...

I let CS know that some ppl are having this issue

I was right on target with the 4-5 hours timer before the server was seen back online.

Rayshen wrote:I let CS know that some ppl are having this issue

And you expect they will listen to you because? ...

Update:
Just got disconnected, now back with the same '... in Maintenance' message, same error code.
Fairly close to writing this game off for good.