I'll reread and edit this comment to express how good this series was to read for me, since it is hard to come back from such a long pause between chapters.
Edit :
The rivalry between the two main characters is a good point, because they both have their own experiences and can learn from each other and improve one after the other.
If not for the charm bs, their relationship would have been very cool to have, and it wouldn't become a problem to have a character constantly surpassing mc everytime.
The problem is that every main character has an insufferable persona.
One is a megalomaniac, the other is a psychopath who doesn't have any feeling for anyone except for the one who's mind-controlling him. His family also isn't very friendly, the only "nice" characters are his coworkers who also have their own motives as to why they do what they do. There's no real bonding on that side.
That's the same for the girl, since she also doesn't care for her "proteges" but just likes to surround herself with weaker and useful people in order to fuel her superiority complex.
The only characters that are nice to follow are the secondary ones, and when the story doesn't expand on them, the atmosphere is always kinda gloomy...
The only remaining thing worth following is the world building and the pretty fights which for sure tend to be exciting, but that's not enough to make this a very good manhua honestly, however well written it is.
The good thing is that the two main characters are not always together.
When they are, manhua can range from 4/10 to 7/10, when they aren't, 6/10 to 10/10, and 10/10 are only very good single chapters, otherwise 9/10 max.
Overall I'd say this deserves an 8/10, the worldbuilding and art carrying immensely. The art can't get a 10/10 though, 9/10 max.