First of all, I would like to say that the characters are well developed. But let's start at the beginning. You do have a lot of characters and all are equally important to the story.

MAIN CHARACTERS
Jungkook To be honest, he has so many different sides to him. At first, he gave me the impression of being a loner with a big secret, afraid to connect with anyone. Due to the fact that the secret might get out if someone comes to close to him. He's very difficult to read. But than otherwise, we have this sweet boy who cares so much about everything but is afraid of showing it as it seems likes he's trapped inside his own body. The relationships he has with his friends are based on his behaviour towards them. Eventhough his character confuses me sometimes, he still a likeable character.

MINHEE
I love her! She's so cute and awkward at the same time. You describe her as this girl who isn't the smartest person in the world but still hold some knowledge to wow people. She has the strangest way to express herself. Most of the time she's actually very clumsy. We do notice some change in her character, as she starts to open up to the goofy bunch of guys who call themselves her friends when they are at the same the friends of Mr Jungkook. Both Minhee and Jungkook seem socially awkward but put them together in a room and there you have it! It's a match full of secrets but lingering friendship, some might say love. But still, you are insisting on them only having a friendship relation. Which is very diffuclt as everyone around them sees it differently.

SIDECHARACTERS
FRIENDS: SUNGYEOL, JACKSON & V, (TAEHYUNG) & LIZZY
You put a great effort in developping your sidecharacters to the fullest as well. They are still are sidecharacters but do play an important role in the story! Because if it wasn't for Sungyeol and Lizzy, where would we be? With a lot of characters going on in your story, you need to pay attention not to get lost in them. Most importantly that the readers are still able to follow. I must say, you did very well. You started by introducing us to Sungyeol and Lizzy, who were on that point of the story the main characters. But you smoothly switched to the real main characters. All the side characters undergo also changes as they start to interact with each other.

In general, you did a great job on the development of the characters. You made sure that everything went smoothly and that changes were getting to start noticeable bit by bit.