share time: 2026-02-07 12:35:39
Su Wan, an overlooked concubine's daughter in the Prime Minister's mansion, is mocked by her family for her obsession with arithmetic—her only refuge is the birch grove behind the mansion, where she indulges in calculations. Until one palace banquet, she uses math to help the exiled Third Prince Rong Jing solve a critical grain allocation crisis. From then on, they team up: Su uses "compound interest" to recover farmers' stolen rent, "probability" to expose a concubine's frame-up, and "game theory" to turn Rong's political fortunes around. As Rong falls for this girl who "understands both numbers and hearts," he vows to make her queen. But Su hands him a paper filled with "heartbeat formulas": "I've calculated all possibilities—what I want most is to count firewood, rice, oil, and salt with you in the birch grove... forever." Turns out, her arithmetic was never just a tool—it was how she calculated the "optimal solution" for love.
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