Online Game: Three Counties at the Beginning

With the countdown to Blue Star's destruction, Blue Star players are pouring into the holographic game "Tianxia" to find the last way out for mankind. Lin Mo, an ordinary young man, was hit by the system as the first prize when he entered the game - he directly drew the hidden identity [Emperor of the Dragon Kingdom]. Starting with three counties, what's the ending? He wants to be the only emperor in the world.