to be set in the player for the link to work, as the server checks if the request is coming from an authorized source. Geo-Blocking
If you speak Korean and want the live feed, you can use a high-quality VPN (NordVPN, ExpressVPN) to connect to a South Korean server. Then visit the official page. Note: You will not get English subtitles this way, but it is the only legal method to view the raw M3U8 from the source (though you won't see the file; the player is embedded). jtbc m3u8