At the beginning I thought it would be a revenge story from how it started, but the author decided to ship off the established character who we thought was the center focus toward the M-loving protagonist which we discover has a huge deep rooted issues from her past. I have no problem with sex as it’s entertaining to watch and make people bond to advance the storyline, what I have a problem with however is how the sex is very awkward and I think the author intentions were for it to be the opposite? I ain’t sure, but I can confidently say that the most likable character is her little sister.
A lot of Korean adult manhwa seems to follow this same structures, as if they really intend to drag their story out or they just want to catch their audience attention- I heard lenzhin don't pay the artist and writers very much, so that might be some of the reason why it's a thing. But we don't get much yuri anywhere so just accept it and enjoy the ride lol.
Showing us fluff moments between characters makes me care more about the story, if the author keeps it up I might even get more invested in the outcome of their future.
I think that was the biggest mistake of the first Lilith manhwa, it was too focused on sex than actual story.