Does anyone know about the photo on Lis's wall? In episode 7 of Sword Art Online, we get to see Lisbeth's smithy. On the announcement board, there is a pinned photo of her with three other people, but in that photo, she is a little kid.

Does anyone know how this happened?
It's supposed to be her old crew where she worked as a blacksmith. However, as the series went on, a lot of people died, so I suppose those 4 or 5 people were the ones who died.