The protagonist's motivations aren't clear even after reading all the chapters so far. You established him in the first chapter as a vengeful man who avenged the death of his family, then after coming to GOT world, suddenly he's shy, playful infront of Elia. Rest of the story is quite good, world building is also excellent, Will's dynamics with Iron Bank and Faceless men are odd with how he holds power them and how Iron Bank bent over for him do quickly.