http://www.inven.co.kr/webzine/news/?news=176511&site=heroes
use google translate
summarized
FREE shared storage for characters level 60+, 20 free slots(?)
must
… (more)complete a quest to unlock it, not account wide, must be done on each character
this change is a part of the "big change" announced a few weeks ago
can't read/speak korean so can't translate this

top comment on this matter from inven was:
This is more convenience than improvement. If you do not want to do that, you have to send it by mail. If you do not like it, you have to send it by mail. That's what makes it possible by default.
I think it's a feature that should have been done since the first time the shared archive was first released.
i agree, but at this moment i'm happy with any change to make the game better
(less)

