So, I know that there are probably some readers that are new to IN2IT. I'm gonna give a quick description on who they are (Their real names) and who they play as in the story.

I recommend you search them up. They are just amazing, I love them. Ok, here we go.

Jiahn
-Calls you Acorn
-Already graduated
-Eldest
-Would get teased about his cheeks

Yeontae
-Already graduated
-Close with Jiahn
-Sometimes quiet but never fails to give you support

Inho
-Your main best friend
-Extremely supportive
-Calls you several nicknames
-Never leaves your side
-Always trying to cheer you up
-Very Enthusiastic and Energetic

Hyunuk
-Close with Isaac
-Moved away but still remained in touch with you (Moves back later)
-Always plays along with your childish ways and energy
-Trustworthy and honest
-Plays the piano

Isaac
-Your younger brother
-Loveable to you and all people around him
-Can be annoying but you adore him
-Playful, Energetic, Cute

Inpyo
-Silly
-Adorable
-Super caring towards you
-Loves helping out
-A great leader

Jinsub (Use to be in IN2IT, but had to leave due to health issues, search it up for more details)
-Caring
-Camp counsellor and Band Leader
-Protective over you and his loved ones
-Has a big passion for music
-Sees something special in you
-Adores you for who you are

Sunghyun
-Looks intimidating but has a big heart
-Can become soft
-Finds you and Jiahn adorable
-Teases you
-Protective

Well,
That's all of em!
Hope this helped you to visualize the characters. Enjoy!