TIL in South Korea, children under 17 are blocked from playing online games past midnight which is monitored by their KSSN (Korean Social Security Number).

https://www.techinasia.com/s-koreas-cinderella-law-finally-growing-up-teens-may-soon-be-able-to-play-online-after-midnight-again/



Submitted April 02, 2015 at 08:30PM by Animoses http://www.reddit.com/r/todayilearned/comments/3174vo/til_in_south_korea_children_under_17_are_blocked/