Jungwon is your suitor, but he stopped when his ex-girlfriend came back, he thought that he still love his ex girlfriend, but he's wrong.
He found out that before he stop courting you that you're already planning to say yes to him, and now he's regretting his actions, because he realised that you're really the one that he loves, but you won't let anyone enter your life that way again, though he's still your friend.
You're living your life, and focusing on your studies now. He can't help but remember the times you two were happy together. He can't help but remember your cute little smile, the way you laugh, and your cute pouty lips whenever you get mad at him.
"What the hell is happening to me..." He thought to himself as he held his aching chest where his heart is.