Good evening, sorry for my English but I am using a translator. As you equip yourself with an LG I noticed the lack of options for displaying subtitles during series or films...
After testing a good fifteen applications from the LG store, I finally found what I was looking for, namely a well-designed, fast and clear application with audio and subtitle options. This is the app
Hot iptv! Found on the LG store (I don't know about Samsung). I've been testing it for a week now (there's 1 month of free testing). However, it costs €11 per device and for life. Hope this helps