Honestly it's a bit confusing, though I've found that a lot of isekai-style manhua are similarly confusing for some reason.
The main character ends up in another world and must complete an objective in order to return to his. The world he goes to is like a story, and the plot has gone sour so he is transported to a point before the characters fight so that he can rewrite the plot into a better ending. But of course things aren't really going smoothly for him and it looks like the plot is already going off course.

The brother-brother stuff is in both his world and the new one, nothing explicit is shown just yet, only kisses and evidence of recent sexual activity with the understanding that it can become an explicit manhua in the near future.

Art is fairly generic, main seme has muscles on top of muscles which isn't my style but is pretty average for BL manhua. Characters are both easy and difficult to tell apart, amusingly. At times it was super easy, but a few characters have a bit of a visual overlap so I got them mixed up until the dialogue gave it away. It was fairly minor though and might be easier for me in future chapters to tell them apart, and might not be a problem at all for other readers.

Not many chapters out just yet, at 10 right now, so it's too early to rate the series or get any sort of comprehensive idea of it.