Ahhh, really? That adds a different depth to scene then. I might rewatch. I thought she meant her actual biological…
At first, I thought so too, but the way Soon Deok kept mentioning her 'brother' to the point that Jung Woo was a bit jealous got me thinking what she actually meant was her late husband. The romantic lantern festival and the atmosphere of visitors looking to matchmake themselves or their children definitely brought her memories back to her beloved husband and their sweet marriage. I could even guess that her wish when she released the lantern had anything to do with her husband, you could tell how she was lost in thoughts watching the soaring lantern.
I think Athens should be the killer, lol. Especially his only secret Queen got is actually nothing. Just being fat when he was little, I mean everyone can be fat when they were little! So we never suspect he would be the killer because of his little secret in comparison to others.
Some people guessed that her friend is the one FL's mother-in-law killed (but not dead).
https://mydramalist.com/photos/425O6_3
https://mydramalist.com/photos/QDdO4_3
https://mydramalist.com/photos/k5o4b_3
https://mydramalist.com/photos/dER5D_3