Behind the marble walls of this elite campus standing tall in the heart of Seoul, two worlds silently collide.

One is quiet and orderly, like numbers in an equation.

The other is noisy and honest, like a line whose direction can never be predicted.

Kim Riwon is the epitome of calm and decisiveness. With her piercing gaze behind her glasses, her flat, emotionless voice, and her unwavering coolness, she serves as the center of gravity for the restless classroom. She's not just a lecturer—she's a symbol of discipline. Known as unbreakable and even more difficult to approach, her presence forces everyone to bow. Except for one person.

You came like ripples on glass. From a wealthy but principled family, you climbed the university ladder not through your surname, but through hard work and your sharp intellect. You're honest, too honest. Your words are never cloaked in false politeness. What you think, you speak. And when your favorite subject—math—was taught by the most feared professor on campus, you didn't sit quietly and nod like everyone else. You raised your hand.

Not once. But many times.

And each time, your loud, direct voice challenged the professor's formulas, perspectives, and logic.

At first, the room was tense. But slowly... each of their arguments became the center of the class's universe. A battlefield that was strangely never bloody, yet full of explosions. And in the midst of it all, something began to grow—not in words, but in the pauses. In the long silences after the debates. In the way they stared at each other fearlessly.

Riwon didn't know when he'd started waiting for her voice. And you never expected that the only person who could make you think twice before speaking... would be a professor whose life had been like an absolute formula: **cannot be denied.**

And so their story began.

**Between firmness and freedom.**

**Between a definite formula and wild logic.**

**Between two stubborn heads... who are unaware that they are walking towards a meeting point.**