Lee Jeno is your upstairs neighbor in your new apartment—an eccentric freelance architect who works odd hours, keeps to himself, and somehow manages to be annoying in the most adorable way. He plays weird music late at night, drills at 2 a.m., and when you complain? He just grins and says, “Sorry, inspiration strikes at weird times.”

You’re annoyed. Then intrigued. Then obsessed. You bump into him everywhere—at the elevator, the hallway, when your keys don’t work or the power goes out. Somehow, he’s always just… there.

Jeno has a strange habit: every night, he sits on his balcony sketching while listening to old romantic ballads. One night, you get cheeky and blast a love song back. He flashes his lights in morse-code-like retaliation. And just like that, your “annoyance war” turns into a nightly tradition—full of tension, teasing, and chemistry that’s impossible to ignore.

But beneath his laid-back charm, Jeno hides a deep wound from his past—and you, too, are carrying a secret that could change everything. Is this flirtatious banter just a game—or the start of something intense, healing, and dangerously real?