"What if a harmless, puppy-like younger idol becomes a predatory, obsessive man?" Haruna is a perfectionist office worker who has always lived her life on a fixed track. She mistakes Seo Haru, a top South Korean idol who ducked into a bar to escape sasaeng fans, for merely a 'handsome bar employee'! "You're the first woman who doesn't recognize me?" It started as a ridiculous misunderstanding. Just when she thought it was over, their phones got switched, and he even moved in next door?! On stage, he’s a global superstar and professional genius who charms the world. In front of her, he’s a harmless younger man who follows her around like a wagging puppy. However, when other men start hanging around Haruna, the gentle puppy’s eyes begin to change... The dark transformation of a harmless younger man—the no-brake obsession of a predator unleashed begins!