To reply to one of the people here, DPRK does have "internet", but they call it intranet over there. North Korea's intranet ๊ด๋ช
does NOT allow access to websites the global internet would offer like Google. So ์ค์ธ๋ฆฌ cannot get on Google Voice and tell everyone she's okay. There is a very small fraction of elites who do have access to the global internet. There is a chance ๋ฆฌ์ถฉ๋ ฌ could have access to the global internet considering his position in the government, but there is a very slim chance ๋ฆฌ์ ํ would be given this luxury as well despite his family status. And I doubt his father would help him by letting him use the global internet for a multitude of reasons.
P.S. I rate the show 5/5 stars in reality. This is just a reply to someone.