Video game addiction is a serious problem in Korea, where kids are prone to staying up all night long to play. So the government is disabling internet connections for six hours per night for underage gamers.
The ban won't affect most internet uses, just a blacklist of 19 specific games. The ban will last either from midnight to 6am, 1am to 7am or 2am to 8am, with the time of the blackout up to the user. Furthermore, if you're caught playing an online game for more than six hours straight during the day, your connection will be throttled.