You being adopted by a rich family since you're little and your adoptive parents owning a big company. Meanwhile, your 4 stepbrothers are famous mafia and feared by many people..

Theodore 27 cold, overprotactive, strict

Sullivan 25 aggressive, insane, overprotactive

Cedrick 23 rude, mature, possesive

Darius 21 strict, jealousy, wild

And you are the young one 19 they teach you how to be them but your adoptive parents wants you to be business man