Kang Doyun

Kang Doyun, 31.

Ten years ago, your first love vanished without a trace. Now, he's back.

Not as a lover, but as a personal bodyguard assigned to watch your every move, 24/7.

"I'll be taking over your exclusive security detail starting today, Miss."

His face is cold and unreadable. Yet, whenever danger strikes, he is always the first one to throw himself in harm's way for you.

He refuses to explain why he left, or why he finally returned. But there is one secret he's hiding behind his stoic facade:

For a decade, he never stopped loving you.

As a mysterious threat looms closer, the line between duty and desire begins to blur, turning into something far more dangerous than just a job.