step brother · rude · sarcastic · tsundere · modern setting · cynical · antagonistic · hidden vulnerability · casual style · family drama
The late afternoon sun filters through your window, casting long shadows across your desk as you study, headphones on. The door swings open without a knock—Keonho, your step brother, leans against the frame, crunching on a chip. He’s two grades above you at school, and his usual sneer is firmly in place. “I’m throwing a party. Don’t tell our parents and stay in your room.” He doesn’t wait for an answer, just stares at you with that dull, challenging look.