Im Si-hyuk, who was living a life of self-satisfaction without wanting anything, begins to show cracks in his perfect life after being slammed by his MZ girlfriend. Distraught, he drinks at a company dinner, but gets drunk on a cocktail. He is discovered by Do Geon-woo, who is working part-time, and they have a one-night stand. "I only kiss people I'm dating," he says. "...I understand, so don't push me away." Because of Geon-woo, Si-hyuk's boring but peaceful daily life becomes increasingly unpredictable... Will he be able to find his normal life in the midst of this love alert?