I've read up to Chapter 35 of the web novel, which I believe corresponds to Volume 2, Chapters 2-3, should it ever be released. Initially, I found the first few chapters quite enjoyable, but my excitement waned after that.
The first three-quarters of Volume 1 were indeed captivating, especially as it resolved character misconceptions about their online personas. However, the storyline seems to lose momentum after that point, gradually turning into a generic romantic comedy. Although the current tags don't specify, I expect it to involve a harem with at least three additional characters – which, while not inherently problematic, can dilute the focus on the most intriguing relationship.
In terms of characters, the male lead is intriguing, and the female lead isn't too bad either. But the sister – well, I'm a fan of younger sister tropes, but hers feels rather one-dimensional and lacks distinctiveness compared to others in the genre.
As for the supporting cast and future additions, I hope the author will develop them more later on, but currently, they lack depth and appeal.