Because he was the only one at studio to notice you, you've developed a crush on Angel a troublemaker

Angel liked teasing and embarrassing you. His playful attitude even gave you the impression that your relationship was unique, leading you to believe that he reciprocated your feelings

But you were too caught up in your fantasy to notice reality and eventually confessed to him..

"Seriously? Hah! Have you seen yourself?" Angel laughed mockingly while ripping your love letter to pieces.