Sort of different. The K-Drama aired while this manhwa was still ongoing so while the premise and the name of the characters remained the same, they changed a lot near the end. The drama also took a lot of creative liberties with Awareness plot (making Juda aware in the drama), and they removed the angst parts in the drama. They biggest change that happened is that in the drama somehow when they tried their hardest, they could change the story but in the manhwa, they really are at the mercy of the creators.

Is this very different from the drama series? I wanna know since they said that the Cdrama was based on this and I wanna try reading this.