Rion living up with her stepmom and stepsister while her father was out there busy working as truck driver. Both of them don't really like her because they are witches to begin with. Everything change when she has take a part time job with a chaebol family.

The World are always known for being big and scary. Seorin never thought one day, she will meet that one man for herself. She's not an assassin but when she needed to save her little brother, she can't help to make a use her pretty great combat skill and genius brain to let her brother free from the Mafia Lord. Seorin couldn't never expect she would find love at the most scariest place.

To be honest Luna like Seungwoo more but then she knows Seungwoo won't look at her way. Seungyoun was never in the picture until the two guy met and decided to be best friend. Seungyoun has his own way sometimes to show that he's interested in her. Seungwoo helps Seungyoun and that wasn't what Luna wants.