So the main plot is that he "rewrites" the memory... That is clear from the description. But not really, somehow the memory he writes and shows them is, in fact, what truly happened. So, everyone that saw his memory realized that he was actually their protector, except for the original novel's MC

At the end of the original novel, the novel's MC awakens the soul of previous gods (Author did this randomly because the readers of the original novels kept saying that the MC was a waste and everything happened only because of the strong heroines,) however this also comes as a fluke/twist, our MC using his rewrite system, uncovers that the novel's MC is not the rencarnation of those Gods, or anything similar. But that he is a being from a superior world that kind of stole those souls/essences, and the original Gods are in fact, the previous lives of our MC.

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So far, the novel describes all of this in a way that you don't feel that you're being thrown BS at your face, and I love that.... But then! After everything is settled, the MC is revived, the novel's MC is dealt with by the heroines + MC. Our MC realized that one of the heroines (doesn't know which one) is the same as the novel's MC, a being from another world with the aim of conquering our MC's world....

Here comes the twist, he ends up having an or*y with all of the heroines on their first night together and at the end of it, they all turn to light and dissappear. Meaning? All the heroines were beings from another world. So now that other world has their biggest families arguing over who won the "bet" over this lower realm world, and we are told that the "heroines" were soul fragments of important females characters of those big families, and now, although not dead, they are just a secondary soul in the bodies of the original girls, who are at their peak, and have no feelings whatsoever for MC.

So in short, we have 200 episodes seeing the heartwrenching stories of the MC with each girl, only to see him lose all of them right after being reunited. Now the plot changes to him trying to awaken those soul fragments in the bodies of the original girls, before they get destroyed of course.

When the MC finally does actually reincarnate, the plot starts moving along, but then we're thrown into some bs cliche situation where his women turn out to be from some higher power and they're no longer really all that affectionate with him due to the fact being he's only been interacting with their avatars the whole time... A beyond disappointing development.

After 200 chapters when the heroines regret and are finally back together with the MC, the heroines disappear in light particles he realizes that they are just soul fragments (clones) of the real heroines who are in the upper realm and they don't have any feelings whatsoever for the MC even despise him as a lower being even after receiving their clones memories. So all you read up to that point feels like bullsh*t and a waste of time.

The trope of ascending to a "higher world" that plagues the xuanhuan genre. Happens here around ch200. Typically it renders the first arc of the novel (which is almost always the best arc) irrelevant and yes that does happen here. Characters that the readers get attached to are abandoned and the main character goes from the strongest to almost the bottom of the totem pole again. All their prior accomplishments become small potatoes. Kind of like starting New game plus just to stretch the length of the story

it's really funny when the "protag" Lin Feng comes to know that our MC was the one who "revived" him when he first "died" and set him on the path of cultivation and who set up all his "adventures". Its like indirectly saying I Am Your Father.