Im Sihyeok had everything and lived entirely on his own self-assurance. After being brutally dumped by his MZ (Millennial/Gen Z) girlfriend, cracks begin to form in his seemingly perfect life.

Feeling lost, he drinks at an office dinner, but gets drunk from just one cocktail. He is found by Do Geonu, an part-time worker, and they end up having a one-night stand.

"I only kiss people I'm dating."

".... I get it, just don't push me away."

Thanks to Geonu, Sihyeok's once boring but peaceful daily life begins to flow in increasingly unpredictable ways...

Will he be able to return to his old routine amidst this "love alert"?