Yes! I read the manhwa before I considered reading the novel, and I noticed that some of the chapters felt rushed. I eventually picked up the novel instead, and I honestly don't regret it! It delves more into Satan's thoughts, and we occasionally switch POVs between Satan and Cain, which is unfortunately something the manhwa seems to have cut out. :(
Wait it's Satin right? The mc name is not satan right? But that's suck then, It'll be interesting if we can see Cain's thought. I don't judge manga/manhwa/manhua arts anymore but they really don't make any effort in serialized this story into a manhwa. I don't even know if the manhwa have offical cover, it's nearing the climax arc but shit we still use the novel cover for the manhwa

Is the novel short? Why does it looks like nearing the end of story?