"Then work with me. Don't be picky." In the height of summer, amid the clamor of cicadas, Yeoeun's ordinary life is completely upended. A 7-year-old step-sibling left behind by her mother—who only ever burdened her with debt— and a mysterious man named Ki Seungdo who appears alongside news of her mother's car accident. The more she gets entangled with him, radiating a colorless, chilling aura, the deeper Yeoeun falls into a dangerous yet sweet trap... Ultimately, she takes Seungdo's hand and begins to cross the line she shouldn't.