Responses

Dojin was in contact with her and Byul accidently found out. By "accidently" i mean the same way Hye-sung found out now.
https://www.mangago.zone/read-manga/love_is_an_illusion_superstar/uu/br_chapter-245718/pg-35/
I hope Hyesung divorces Dojin and leaves with Luna. Byul can go stay with his abusive grandmother and manipulative father if he wants to.
How would Byul know about his grandmother if Dojin hadn't introduced him to her?