The girls a badass really. She was raised with only her dad and her one best friend Park Miyoung. These are the only people she's nice to. Since the moment she was born, she was always told to "trust no one", and so she didn't. After school, she lets out all her anxiety by going downstairs and punching the punchbag or shooting at targets.

Hyuna's best friend since childhood. Since Hyuna's father raised Hyuna to be kept away from people for "protection", he made sure that his daughter would still have a friend. He chose Miyoung, the daughter of his most trusted fellow businessman for this job. Hyuna and Miyoung are inseparable.

Well...You can read the book to find out more about him.