Jiang Xianshou is a genius who stands at the top of the modern mathematics pyramid. He solved world-class problems at the age of sixteen and held several scientific research patents at the age of twenty. His mind is full of formulas, deductions and unfinished academic territory. An unexpected explosion in the laboratory caused her to fall into Bianjing of the Song Dynasty a thousand years ago when she opened her eyes again.
Green tiles flying on the eaves, boats on the Bianhe River, and the cries of hawkers in the bustling market replaced the hum of laboratory instruments. She was dressed in a worn-out skirt and became an orphan living on the streets. Being penniless and without any relatives, even the most basic survival has become a problem. But Jiang Xianshou never panicked. With her photographic memory, she integrated arithmetic thinking into daily necessities - calculating the fluctuations in food prices, figuring out the best selling routes, and even helping street vendors sort out their accounts, and she managed to gain a foothold in a strange dynasty.
Her intelligence quickly attracted the attention of Shen Yanci, a talented scholar in Bianjing. Shen Yanci came from a scholarly family and was obsessed with the study of objects, but was trapped in the shackles of ancient arithmetic. When he first met Jiang Xianshou, he thought he was just a smart folk woman, but when the "unknown numbers" and "geometric theorems" she casually mentioned were able to solve the problem that he had been thinking about for months, a storm surged in his heart.
One is a mathematical wizard from the future, and the other is an elegant scholar from the Song Dynasty who is deeply involved in tradition. They discuss calculations on the chessboard, and talk about objects in the study. In the fireworks of Bianjing, the two hearts get closer because of arithmetic, and merge because of understanding. But the dynasty gap, the difference in status, and the hidden troubles in the court are all waiting for them. Jiang Xianshou gradually understood that the most complex formula in the world was never a deduction on paper, but the twists and turns of people's hearts.
