im sorry;미안해

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Kim Seunghee

- last year in high school, and she's interested in becoming a doctor. she's studying to take her placement in a medical college
- she gets a letter in her desk, telling her to not invite the new transfer student out after school and to take care of him
- the letter includes the list of events that will happen in that day. she first thinks it's a prank, but everything in the letter begins to happen

Im Changkyun

- a transfer student from seoul, who seunghee first encounters when she falls in front of him, and he helps her up
- he kills himself in the future, stated in the letter that seunghee has
- he's seen getting mad at his mother because she threw away him laptop even through he doesn't make music anymore

Park Jinwoo

- he is close to seunghee, and scolds his friends about food
- he's assumed to like seunghee, seeing he gets jealous when he sees seunghee with the letter, thinking that it's a confession letter

Chae Eunmi

- one of seunghee's friends, and part of her group of friends. they are always together.
- she's seen with wonwoo in the beginning of the story, waiting with him for seunghee+jinwoo
- she's known for always having her hair perfect and her clothes are always perfect

Jeon Wonwoo

- he's also part of seunghee's group of friends. he's close friends with jinwoo.
- he's first introduced when he was waiting for seunghee+jinwoo, remarking that they were "five minutes early"

Kim Wooshin

- he's very close with sohye, seeing as they get breakfast together and he let her in line first.
- he argued with sohye because of a bagel
- he is also close with jinwoo

Lee Sohye

- she's closest with wooshin and seunghee from her five group of friends
- she doesn't like to argue
- but she argues with wooshin over a bagel

≫ this book is inspired by Takano Ichigo's manga called Orange.