Responses
maybe that detail will be revealed later on.
It's not revealed yet because this is a journal entry based on Yeonha's father's perspective. More details will be revealed when we get into the full backstory of what happened on the day of the massacre.
Did the story change a bit from the novel, because in the novel the assassin now boss of the chameleon troupe purposesly put hajin in the orphanage because his mother make a dying request, and at that time she herself was a little girl