Kim Jungkook age 25 who is the second oldest. He has a older brother and a younger brother who  thought he died. His the Ceo of the Kim cooperation of his late father's business. He can be strict  cold towards others except his brothers. Loves his younger brother and hates to see him cry.
Scared of Taehyung's strictness when it comes to health. His also a mafia boss which no one knows not even his brothers.
Friends with Park Jimin and Jung Hosoek

Kim Taehyung,age 27 who is the oldest. He has 2 younger brothers,  his a doctor for his own hospital. His really strict when it comes to health, scold Jungkook for spoiling Yoongi. He hates when the younger cries. He loves his brothers very well. Friends with Kim Namjoon and Kim Seokjin

And lastly our cute lilmewomewo

Kim Yoongi, age 19, who was abandoned when he was born. He never knew his brothers as he was adopted. He is a college student. Known as lilmewomewo or Yoonie, he had a bad past. His a little, he has 2 older brothers. His cute,  Savage,  soft hearted,  an adorable gummy smile,  he is very sensitive.
He has asthma and a weak immune system due to his past. Loves his hyungs,  doesn't have any friends.

Sub characters

Kim Namjoon  assistant and best friend with Taehyung
Kim Seokjin  one of the doctors and also friends with Taehyung
Jung Hosoek  his postal assistant and friends with Jungkook
Park Jimin best friend with Jungkook
Mr and Mrs Kim- taegikook's parents 
Mr and Mrs Min - Yoongi's foster parents
Lee Minho assassin for Jungkook
Jackson Wang (can't leave him out 😅) the enemy