No. Prior to the little sister being abducted, they hadn't even known each other existed.
Yeah, but they were little. When she was looking for her sister and she saw a painting/picture with a family, she had a memory with a house on fire. He had the same memory with his family.
So this is ep 10 summary/my conclusion after watching it :1. 444/ Black is Joon/Moo Chan, he think he is one of…
I don't think Moo Gang is Joon's step brother. I think Moo Gang is Joon and `his mother` is not his real mother, but the doctor is the mother of his step brother and she is just lying. And his real mother is the `fake` mother of his dead step brother. I think that the doctor just wants him to be her son because she lost her real one. When Ha Ram caled Moo Gang as `Joon`, the mother said something about how she knows his name if he can't remember or something like that.
She saw that picture and she remembered that too.
( the one who wears green clothes in the poster)