After Jon traveled through time, he asked himself a question: Can the Night's Watch save the Seven Kingdoms? Answer: The Night's Watch cannot save the Seven Kingdoms! So he quit the Night's Watch. After becoming a lord, Jon asked himself: Can being a lord save the Seven Kingdoms? Answer: Even a lord cannot save the Seven Kingdoms. So he challenged the Iron Throne that rightfully belonged to him! PS: The protagonist Jon Snow begins by traveling south to participate in the War of the Five Kings.

Viserys

When I first crossed over, I thought the most insidious enemy was Varys.

I killed Varys.

After getting rid of Varys, I thought the most insidious enemy was Illyrio.

I killed Illyrio.

I killed Illyrio and I slew the centaurs.

The destruction of the Centaur Free Cities has become my biggest worry again!

ah,

I understand more and more now.

My greatest and most sinister enemy is not Robert, not the White Walkers,

He's right above my head!

He is the high and mighty god worshipped by everyone!