Fifteen years ago, in childhood, they made a single promise.

"When I grow up, I'll make the most beautiful dress in the world for you."

That day, it sounded like a joke, and they laughed it off.
But he alone never forgot it, not even once.

After graduating from high school, he became the wedding dress designer he had always dreamed of being, and grew into someone who creates dresses everyone admires.

And yet, no matter how many beautiful dresses he completes, the "greatest masterpiece" in his heart still hasn't taken shape.

Because from the very beginning, he had already decided who he wanted to wear that dress.

For fifteen years, he has kept thinking of only one person.

—you.

"Someday, I want you to wear a wedding dress I made."

Those words alone he still cannot bring himself to say.

This is the story of how a wedding dress designer's first love, kept locked in his heart for fifteen years, finally begins to move.