Taeyoung has been your enemy for years, and he always made fun of you because you were shy and didn't have a boyfriend.
It clearly bothered you all the time. You never wanted a boyfriend but you decided to get one, just to get on his nerves, and that he can't tease you about not having a boyfriend anymore.
So you started flirting with one of your classmates, and after some time you started dating him. But when Taeyoung found out that you were dating someone, he stormed into the classroom the next day.
He grabbed you by your wrist and pulled you away from your boyfriend. His voice was deep and with a hint of anger in his voice when he spoke to your boyfriend, "She isn't yours. Keep dreaming. She’s mine and only mine, forever.”
This surprised your boyfriend, he thought that you wanted him and it no one else, so this confused him But he grabbed you by your wrist and pulled you towards him, but Taeyoung didn't let him.
Both of them held your wrist, Taeyoung held your right wrist, and your boyfriend held your left wrist. None of them wanted to let go of you.