Im Si-hyuk, who was living a life of pride without lacking anything, starts to show cracks in his perfect life after being completely rejected by his MZ girlfriend. Feeling distraught, he drinks at a company dinner but gets drunk on a cocktail, and is discovered by Do Gun-woo, who is working part- time, and they have a one-night stand. "I only kiss people I'm dating." ".... Okay, so don't push me away." Because of Gun-woo, Si-hyuk's boring but peaceful daily life becomes increasingly unpredictable... Will he be able to get his daily life back in the midst of this love alert?