I have never understood why Hana's mother was killed. She was propped up as if on a stage to be judged for what? For being homeless? For being a homeless minor taken in by an abusive adult man? For hiding her kid out in the center instead of keeping her at the killer's home?

I might very well have missed some context as I always do something else while watching tv shows, but I just cannot for the life of me understand why she was killed,

Honestly I am not 100% sure why but maybe the reason here was that a mom who was supposed to protect and nurture failed to do so and was just a bystander and being a bystander sometimes is just as bad as being a perpetrator. Plus I think during this ep the website was still online and maybe she was judged there..... or it was Eun Ho impulse to save the child...... honestly it could be any of these variables unless I missed out the key point.