This is a discussion on Only me with invalid password problem? within the Tech Support forums, part of the Knight Online (ko4life.com) category; wtf??...
Very detailed thread, But this should also be posted in tech support.
Thus far, You have not said if it was Ingame, The website, the forum, Or what.
now find a clear mind and try to rescue what is left to rescue.
if its ingame try to recover it asap and change all ur infos even ur email... hopefully ur bugged and not hacked