After solving one of the greatest unsolved problems in mathematics, the Riemann Hypothesis, genius professor Shin Ijun becomes a global legend… only to die at the peak of his life.

But death isn’t the end.

He awakens as Yoo A-yeon, the newborn daughter of his former student Han Seol-ae and his close friend Yoo Jin-hu.

Now living in the body of a child, with the mind of a world-class mathematician, A-yeon grows at an unnatural pace, hiding her past life while quietly devouring books, solving complex theories, and reshaping the limits of human intelligence.

From teaching her baby sister her first words to passing high-level IQ tests, her days are anything but ordinary.

But when the truth can no longer be contained, A-yeon makes a choice:

To reveal her identity… and finish what she started.

With her mother’s help, and under strict "health-first" rules, she steps into the global spotlight once again.

The world begs her to become a professor.

There’s just one problem.

She’s only seven years old.