Because the show’s pretty first episode. They destroy Males and bears and in some cases dragons and turn them into ice zombies that sign up for the ranks of their army. Nevertheless it’s never ever been clear just what the White Walkers, or their leader the Night time King, https://liantong.com.tw/%e6%a1%83%e5%9c%92%e6%88%bf%e5%b1%8b%e4%ba%8c%e8%83%8e%e8%b2%b8%e6%ac%be%e7%94%b3%e8%ab%8b%e6%b5%81%e7%a8%8b%e8%88%87%e5%b8%b8%e8%a6%8b%e5%95%8f%e9%a1%8c/