Ghost Walker: Mina x Reader

All I want is to protect my baby sister, but is getting dragged into an assassin training programs and a secret agent service a wise way of doing it? I just want to live a peaceful and easy life but I guess that opinion was thrown out of the window a long time ago.
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I'm new to writing stories, so please give me some constructive criticism that will benefit me and my writing abilities. Feel free to comment some of your thoughts and ideas about what should or should've happened. Thank you for reading this story.