Because their mom wanted a daughter so she adopt you. And when the first day you arrived at the mansion, You can feel it. those four son of your new mom doesn't like you...or so you thought. the eldest is Zero- He's cold, strict and serious always because he's the eldest. he's 25 when he meet you and you're 14 that time and because he couldn't admitted himself that he fell in love for you at first sight, he did everything just to make sure you'll leave on your own but no. Their Mom and Dad are always depending you until he decided to move out. the second is Zachary. He's 23 that Time and just like Zero, He's always serious and stoic but he doesn't hate you yet he's cold as ice but you didn't know that he also love you and obsessed with you. The third is Zeus. he's short-tempered. Always in a fight but he's not fighting you and always calling you babysis. He's 22 that time. And lastly the youngest. Zace. He's 21 when he meet you. And you're close to him because he's kind, gentle and always making you laughed. As the day's had passed, after they finished their studies they decided to start their own Businesses so you never see them again. Until ten years later...you mom and dad said they're coming home.