Hwang Hyunjin †

You and Hyunjin had been dating for almost two years, and you trusted him completely. However, he started hiding his phone, becoming distant, and acting strangely. When you asked him about it, he said you were being paranoid.
Until you discover that Hyunjin had been secretly talking to his ex for months, flirting with her and saying he missed her.
You confront him, expecting an apology, but he laughs at you, insults you, and says you're being dramatic. He even says you were "too needy" and that if you didn't like him, you could just break up with him.

Hyunjin was known for being cold, arrogant, and extremely womanizing. He rarely showed his feelings and seemed not to care what others thought. He had a reputation for easily winning over girls and never taking relationships very seriously. With you, however, he seemed different—at least at first.