After watching the whole seasons of game of thrones,like every body else I felt angry and not contented with the season 7 episodes .It felt like something is taken away from me(obviously season 7 is 3 episode short than the others).So I immediately search when the next season will start,sadly it will take a long time for that.In order to ease my pain I watched many youtube videos of Game of Thrones,then I stumble to a certain video talking about Jon Snow being the Night King.In the plot they say that the ending will be a bittersweet one.This came from the author itself Mr.George R R Martin,maybe the humans will triumph against the white walkers but in a big cost in return.Maybe they will win but will lose Jon Snow in return,maybe he will face the same fate as his uncle Benjen that turned to a white walker but still has his own mind and do have a control of his own body.Jon SNOW will lead the whte walkers.He already lead the Night Watch,the Wildlings,the entire North and soon the White Walkers.Can't wait to see the revelation in the near future,I know you feel the same too.What you think about this theory?feel free to comment and share your thoughts.