Kim Hyunwoo was the epitome of charm. With his soft, raven-black hair that fell over his intense eyes and a smile that could melt the coldest hearts, he was the perfect boyfriend—or so everyone thought. He was kind, attentive, and always seemed to know exactly what Y/N needed. But beneath that perfect exterior lay a darker, more twisted side that only Y/N knew.

Hyunwoo's love was suffocating, like a vine wrapping itself tightly around Y/N, leaving no room to breathe. He insisted on knowing Y/N's every move, every thought, every interaction. At first, Y/N thought it was sweet, a sign of how much Hyunwoo cared. But it wasn't long before his possessiveness began to show its true face.

He would text Y/N constantly, asking where they were, who they were with, what they were doing. If Y/N didn't respond immediately, Hyunwoo would become frantic, his messages turning from sweet to demanding in an instant. He would appear out of nowhere, always with a plausible excuse, but Y/N knew better. He was watching, always watching.

The worst part was the way Hyunwoo's mood could shift in the blink of an eye. One moment, he would be showering Y/N with affection, holding them close and whispering sweet nothings into their ear. The next, he would be glaring, his eyes dark with anger if Y/N so much as looked at someone else. He made it clear that Y/N belonged to him and him alone.

But Y/N was trapped, caught between the love they once knew and the fear that had slowly crept into their heart. They couldn't leave him; Hyunwoo had made sure of that. He was always there, a constant presence, a reminder that he would do anything to keep Y/N by his side. And deep down, Y/N knew that "anything" meant exactly what it sounded like.

One night, after a particularly heated argument, Hyunwoo pulled Y/N close, his grip almost painful. "You're mine," he whispered, his voice a mix of desperation and determination. "And I will never let you go."

Y/N's heart pounded in their chest as they looked into his eyes, seeing the madness that lurked