Educate him, what else?
In all seriousness though, online-game addictions are a very serious issue and should NOT be taken lightly!
You need to teach him to do the responsible thing and start restricting his game time by himself.
Simply restrict his play-time to a couple of hours per day (or whatever figure you see as more fit) and tell him that if you catch him playing even a minute more that he's allowed to, you'll simply take the power cord for, say, a week...
And while informing him on all this, remain as calm as possible, even if he'll go berserk - the important thing is to show him that his hysterics won't get him anywhere, so don't show him that his screaming is taking any effect on you!
Eventually he'll learn to be responsible with his time.
P.S.: Knight-Online? Of all the crappy free-to-play MMO's, he gets addicted to this?
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