The last equation

**The Last Equation**

At eighteen, everyone receives their Soul Equation-a mathematical formula etched into their skin that proves one thing with absolute certainty:

Somewhere in the world, one person was made for you.

In a society where love is calculated, marriages are decided by compatibility scores, and destiny has already solved every heart's equation, no one dares question the system.

No one... except her.

Y/N is a theoretical mathematics student whose Soul Equation has never behaved like anyone else's. Unreadable. Unstable. Defective.

Lee Heeseung is everything the system calls perfect. His future has already been written, his soulmate already chosen, and his life already planned.

They were never supposed to meet.

Yet beneath the quiet glow of midnight practice rooms and the sound of unfinished melodies, they discover something neither science nor destiny can explain.

When two impossible equations begin to resonate, the universe itself starts pushing back.

Because some mistakes were never meant to exist.

And some loves were never meant to be solved.

**What if the greatest equation ever discovered... was the one that proved destiny wrong?**