Okay so this is a long shot because I read a bunch of stories by this mangaka around 2015, and can’t quite remember the plots for most of them. Their stories were really popular though and were always in the like top 20 most read and that kind of thing on different sites.
What I do remember though is that the characters were always connected through their authors different works. Some of the couples were also vers/ switched often. This is why I’m actually looking for this mangaka, I miss seeing this lol.
The one story I slightly remember had a character named Ren and he had slightly longer dark hair and had a tattoo on his back, and got into some sort of trouble and moved away while in school. I know this isn’t much to work on but I feel like someone has to know, thank you!!!