I don't have enough information to determine exactly who Judith Kay is. She could be an ordinary woman who gets caught up in an extraordinary situation involving the mirror.
Kay might be the person who created this unique fan fiction world. In the context of the story, Kay could also be a protagonist or an important side - character. Maybe Kay is an archaeologist who discovers the mummy and experiences the unexpected comfort. Or Kay could be a local guide in an area with mummy - related legends, and through some adventure, the comfort aspect comes into play. Without reading the fan fiction, it's hard to be certain.
Not necessarily. You can start with any book and still enjoy the story, but reading them in order might give you a better understanding of character development and overarching plotlines.
Not necessarily. How things are done in a manhwa can vary greatly. It could be similar in some cases, but different in others due to artistic choices, story direction, and audience preferences.
I don't have any specific information about Selena Kay's back story as the name is not familiar in a general sense. It could be a personal acquaintance for some, or a name within a niche area.
Well, I think it depends. Sometimes the portrayal of ghosts in manhwa is so imaginative that it's hard to take it seriously. But in some cases, they can add an element of mystery and excitement. So, I'm kind of on the fence about believing in them.