I know everyone is talking about Jisoo. But, i would like to know more about the zombies. Are they scary looking like in "All of us are Dead" or just extras in makeup?
She lost her parents when she was very little so it's not strange for her to call him uncle when he's the only…
The scene where she was in the hospital of the accident was essentially the same child actress, so she was young but still old to know who her uncle is. An uncle is still an important figure in her life. I find it odd, especially since the uncle told his romantic interest she can't be the neice's "mother".
K-Drama 
*I haven't watched any episodes yet.