Honestly, I'm genuinely enjoying this novel, but I have two complaints -- one is a minor, subjective thing that I personally am not a fan of, but I am only including it for the sake of honesty because it should be noted that most people would disagree with me.
This first criticism is that the development of the harem itself is extremely slow given the limited available content. If there were three thousand chapters out, the speed of their inclusion and the development of the relationships would be fine. But 130 chapters in, he is only technically with a single person. There are two others who are "potential" members, but there is no knowing when they will make that happen. Most people like slow developments, and I am not criticizing it as objectively wrong, but it certainly is a slow burn.
The second criticism is a real one, however, and I feel most people would agree with that.
The author's writing style became, VERY quickly, extremely repetitive.
He will repeat the exact same sentence in several variants back to back to back, as though the reader was incapable of grasping his point without having it forced down their throat.
This is the perfect example, and a true outtake from the book in chapter 131:
After talking with Ace for several minutes, Layla suddenly felt sleepy. "Ace, I'm sleepy."
It was raining heavily, and it felt comfortable in Ace's arms, so she suddenly felt sleepy.
"If you are sleepy, you can sleep now." Ace told her to sleep if she was sleepy. "
That's a real series of sentences really pulled from the real novel.
And that's not an outlier moment, there are examples of that style throughout the entire thing -- frankly, it becomes extremely annoying, but given the positive aspects surrounding it, it's bearable to a degree.