Han Jisung⁷

Han was your best friend and you were his.
You had a boyfriend who was a real jerk, his name was Choi Yeong
Han hated him not only because he was a jerk, but also because he was the worst human being (narcissistic, manipulative, etc.)
Han was falling in love with you, and that's why he hated your boyfriend so much.
-Scene
Today they went on a school trip
Your boyfriend was paying attention to his friends and a girl...named Nari
Han introduced Nari to Yeong so that she would deceive you.
I'm leaving you out and including you with his friends
At the end of the trip they loaded your suitcase
You tried to take it off him, but he wouldn't let you.
"Beautiful!...Yes! I'm carrying it myself!"
He never called you beautiful or by any affectionate nickname.
He had planned to confess his feelings to you on that trip, but first he had a plan to make you break up with your idiot boyfriend...