The Secret Martial Artist of Demonic Blood

It’s really heavy on the Ocean 11 style. Where they spoil you with something and then skip that something just to have it as a flashback in next chapter or after 2 chapters. And it’s done so many times trough 17 chapters.
Like how chapter 12 ends then we see what the mc was talking with Cain on how the tactics work out what they are about to do in a fight with Cain father. Then there is week left to enter the academy and mc needs money so he will need to use his modern knowledge to invent something and ask Cain for help finding merchant. And then skip all of that and have it as a flashback in next chapter where he needs to use money.
And that is all to just stall the chapters to end with a cliffhanger

And then it’s the typical commoner vs noble where the mc is for some reason hated and sabotaged all the time while there are other commoners but they are not even tough it makes no sense as what the other commoner is doing is a lot worse and would deserve it more. Like a commoner who is top at the exam and then on the first day as the opening day in academy will be naked and challenge everyone but he does not get the hate of the nobles for some reason