A windswept encounter on a Scottish beach one day has the potential to change everything for both of them.

"You're playing with fire" "You handed me the matches" - Everyone around her is dating - falling in and out of love like it's nothing. And her? She's still waiting. Still picky. Still single. So she makes a quiet promise to herself: The next guy who asks for my number... I'll say yes. No overthinking. No excuses. Just yes. And then he walks in. Black coffee. Sharp suit. A calm, confident smile. He asks for his drink - and then asks for her number. She remembers her promise. She says yes. Smiling, heart fluttering, unaware. Unaware that he's Choi Seungcheol - 27 years old, a well-known business heir with a reputation for being untouchable. And she? She's 19. What started with a black coffee might just change everything. Because Seungcheol isn't interested in a fling. He's already chosen her - and he's not the type to let go.