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 because he was the worst kind of human being (narcissistic, manipulative, etc.).
Han was in love with you, and that was why he hated your boyfriend so much.
—Scene—
Today, you all went on a school trip.
Your boyfriend was preoccupied with his friends and a girl... named Nari.
Han introduced Nari to Yeong just so he would cheat on you.
He left you out of that and included you with his own friends instead.
At the end of the trip, Han carried your suitcase.
You tried to take it from him, but he wouldn't let you.
"Beautiful!... Stop it! I'm carrying it!"
He had never called you beautiful or used any affectionate nickname before.
He had planned to confess his feelings to you during this trip, but first, he had a plan to make you break up with that idiot of a boyfriend...