Both Seyoung and Luna are bestfriends. They met on their first day of school in Seoul Arts High School. Both of them knew they have brothers but they never introduce their brothers to each other. Both of their brothers are friends too, close friends. They knew both of them have sisters but they never introduce their sisters to each other.    "Would you mind if I date her?"  "Not at all. How about you?"  "I'm okay with it. I entrust her with you." Lu