Characters:

Choi Hye Li (you)
-Main character
-18 years old
-from Ulsan
-lives with single mother, younger sister & younger brother
-she never gives up her dream although she always thinks negatively.

Jeon Jeongguk
-Main character
-18 years old
-from Seoul
-doesn't give up easily when he wants something
-possesive
-hopeless romantic

Park Jimin
-Main character
-19 years old
-from Seoul
-gets jealous easily
-shy boy
-friendly and sweet

Bangtan Boys
-supporting characters
-consists of Kim Namjoon(rap monster), Jung Hoseok(j-hope), Min Yoongi(suga), Kim Seokjin(jin) & Kim Taehyung(v)
-friends of Jungkook & Jimin
-the typical flower boys of the school
-well-known for being talented in music in school
-the 'glee club' of the school (only they're respected by students in the school)

Choi Hee Jun & Choi Hae Ra
-supporting characters
-fraternal twins, younger siblings to Hyeli
-both 15 years old
-supportive towards their noona/eonni
-sometimes lazy
-loves going out with friends

Park Rye Wae
-supporting character
-mother of Hyeli, Heejun & Haera
-single mother (divorced)
-has a boyfriend
-loves her children but sometimes she's too busy with her 'boyfriend'

And other characters as well... ^^