Funny how she sees only the nice pictures and not the horrifying ones!
Dude didnโt know when he was a young child because duh, he was a young child and his sister was shielding him. Fine. But we also know it went on after that since both Eun-su and their mom tried to kilo themselves when Eun-su was a teenager. So you mean to tell me that even when the brother was old enough to be mindful of what goes around him, he did not realize the noises he was hearing were their dad beating their mom?!