An issue of the manhua format is that it'll cut everything short. While there is undoubtedly a lot of padding and unnecessary content in the novel, it at least has everything. This is a story that requires all of the details. It will not be that good unless you know most of his thoughts.
The basic idea of this story is that the mc is someone who transmigrated/reincarnated from earth and lived a truly horrible life, too horrible for words. He was always living the hard way and despite trying his best at going the more bright and sunny way, life screwed him over all the time. He ended up getting warped by his experiences and spent hundreds of years learning this world's way of life. A way of life with big wars, battles and death everywhere and where you're nothing but an ant if you don't have power and take everything in your own hands. Having no other way out, we can say that he became somewhat insane, rationally insane, not the illogical crazy stuff, just insane, scheming, ruthless, heartless and doing everything for benefits and to further his own goal, eternal life and rising above everything.
He has seen the bad sides of people all too much and can't trust anyone, which is completely justified since most people tend to be assholes in this story. They live by the law of the jungle, even the "justice" side of things are just full a bunch of hypocrites that pretend to be good but act more like corrupt politicians who wouldn't hesitate to backstab people for their own benefits.
This guy was finally chased down and killed, travelling the river of time with the help of spring and autumn gu which he created, a legendary "gu", going back to where it all started. Now he will rise to the top by all means necessary, there are literally no moral barriers in his mind, if it'll help him in any way, he'll do it, if not, he won't, it's all about benefits, not so much about enjoying killing people. His actions are evil and he's a scheming bastard, but that's why we should love it. He starts low and life just hits him below the belt over and over again, he does his best and more but he still has to struggle and barely scrape by.
Well, the point is that the novel will let you in on his thoughts and the background of his actions. It will let you understand his logic and come to appreciate his behavior. There are gruesome parts and everyone is there to get used, nothing more. Nothing is more satisfying than when he finally reaps his benefits after long, long struggles at the edge of a blade, the grand reversals are some of the best ones I've ever seen. Characters that would normally just be trash to be discarded are kept despite being annoying and keeps on being developed and used, people don't just die instantly because the mc doesn't like them.
The manhua, however, rushes everything and doesn't provide enough explanations for his actions. Thus we get people like PZcolo who doesn't know what they're talking about, they read the manga without knowing the actual story and every necessary thought, as such his actions just seem to be those of a psycho taking pleasure in murdering people randomly for no reason, not really a good experience, I can understand that. This story is nothing without all the lengthy exposition and internal monologue, so read the novel. The manhua can be enjoyed after you've read the novel as you will know what's really up. I feel like turning it into a manhua was a mistake from the start, it doesn't work well with such a format.