OK. I known I should've done it before starting the story a I thought I would give the ages as I make the characters appear in the story. But I didn't. So here it is.

♥ Kim Seokjin, 23 year-old, just completed his studies.
♥ Already earns a large sum of money, works at a very popular company in Seoul.
♥Has a naturally kind and loving nature.
♥Loves cracking Dad jokes.
♥Had taken the responsibility of fostering two kids by himself.

♥Min Yoongi, 13 year-old, lived in the streets after being abandoned by his parents.
♥ Barely manges to get food for himself and his step brother.
♥Has a cold and little rude nature, but cares deeply for his loved ones.
♥Fostered by Seokjin.

♥Park Jimin, 5 year-old, abandoned too.
♥Lived with his older step brother Min Yoongi in the streets untill Seokjin took them up.
♥Extremely cheery, bubbly and sweet nature. Keeps on doing Aegyos when he wants something as he knows nobody can resist how cute he is.
♥Fostered by Seokjin too.

♥Kim Namjoon, 21 year-old, a senior in college.
♥Very intelligent. His words always makes sense the most. Can handle any situation very calmly.
♥Very clumsy too. Has broken almost every elements that exists in the world.
♥Very kind and humble nature. Knows the best how to comfort. Known to the strongest person mentally by Seokjin.
♥Seokjin's best friend since childhood.

♥Jung Hoseok, 22 year-old, works with Seokjin.
♥Very energetic, known as a ball of sunshine, can lighten up your mood in 0.003 seconds.
♥Kind and sweet but also scary when angry. But has never raised his voice at his friends. Probably every human in this planet love him.
♥ Has been Seokjin's friend ever since they started working together.

♥Kim Taehyung, 19 year-old, junior in college.
♥Cute and weird personality, likes attention a lot, an extrovert. Makes friends with everyone very quickly and without difficulty.
♥Seokjin's friend whom Seokjin treats like a child.

♥Jeon Jungkook, 17 year-old, high school student.
♥Can act matured and childish at the same time. Is pampered a lot a he's the youngest the the group of friends.
♥An introvert. Very talented. Can do almost everything mankind has invented. Keeps his friends entertained.
♥ Is like a little brother to his friends.

♥Byun Baekhyun, 13 year-old, middle school student.
♥Harsh and arrogant nature. Bully of the whole school. Never takes others opinion as an option.
♥Very rich, multi-millionaire.

♥ Lee Félix, 13 year-old, a middle school student, slightly younger than Baekhyun.
♥Harsh and arrogant, the bully of the school,just like Baekhyun but gets confused with how to treat different people.
♥A multi-millionaire too.
♥Baekhyun's best friend.

♥Son Chaeyoung, 14 year-old, middles school student.
♥Bossy and savage, isn't afraid of anyone.
♥Sometimes talks harshly, says hurtful words and even beats up people but never goes to a great extent. Treats people the way they treat her. Cares and treats nicely the people she thinks is good.
♥ Yoongi and Jimin's friend.

Now that the characters had been described properly, I hope you won't have anymore problem while reading the story;-)