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You have listed 2 of the worst things in this novel - MC, and the brat. And the answer to your question is yes, the MC and brat will change for the better in the future.... near the end of the novel (somewhere around the last 100 chapter). So its not worth reading for the future "character development" when the author clearly wanted things to stay at the status quo for the vast majority of the novel. As for your second question, there will be more action in the future but this novel is primarily slice-of-life, so you're reading the wrong novel if you're primarily expecting action.
Instead of benching this novel, I highly recommend you to throw this crap into the trash. Its perplexing how this is one of the 2 reviews with a sub-3 star rating within 5 pages of reviews. The MC is a fucking bastard to the girl OP described for like 80% of the novel... on top of a slew of things I cant bother to type.
There's no way the author could cram literally every side character into the MC's harem, but I can assure you that there would be around 20+ of them in his harem by the end of the OP world. ====================SPOILERS!!!!!!======================= This novel only stays in the OP world to the end, with a confirmation from the author in the afterword of a second part (most likely venturing out of the OP world)
You wont go wrong reading this novel if you're fine with the genres and tags. The only criticism I have for this novel is the author's broken English, which could be fixed by hiring editors. Sadly, 80% of the novel is unedited which makes for a tough read. I sincerely hope the author hires an editor for his next novel!