So first story is Dojin and Hyesung which are the main characters , second main characters are which is dojins older brother Dojun and his manger / best friend Heesoo who are married and then third characters are Dojuns ex wife chowon and hyesungs best front kyunsoo who are also married and lastly Park Byul who is Dojin and Hyesungs first child and his childhood first love Cha Siwoo
adding to this that the work before LIAI is set in a normal word, not omegaverse and though they exist there, they're like very minor characters (both of them), both were just linked to this hyung guy that the seme of that story was originally crushing on. So basically Hyesung was a sidepiece of that hyung and Dojin was a sidepiece to one of that hyung's posse, then they were both dropped at some point and met each other; I don't remember if they became romantic coz again, they're just minor characters, but they defo slept with each other even then.
Can someone please run down a quick summary of how the characters from four stories connected to each other? I've only read og love is an illusion but that was years ago i already forgot the plot and characters beside the main characters. I don't have any plans right now to read the queen cuz it's love triangle (not my thing) and other one i tried reading but didn't catch my interest that much so, I stopped. But byul's story is pretty interesting to me but I kinda confused with the family tree lol