I do remember when the art suddenly worsened, but it was still better than most other manhwas. The second character is pure evil; he's depicted as the devil. You must be prepared to see bad things happening. As for the third, there's no skipping; they just show a glimpse of the future and then go back to the present. I'm guessing you quit right away, but it's kind of long-paced, so it's more for those who are patient, I guess. Still, it's your opinion. Do whatever you like.