On her first day as a trainee bank teller, Su Wanxing accidentally swipes a supreme black card with an unlimited balance, triggering the highest-level alarm in the global banking system. Lu Chenyuan, the young bank president rumored to be cold-blooded and in control of a vast financial empire, arrives by helicopter. He not only asks her to become his personal banker, but also makes her his nominal fiancée with a contract. From an ordinary teller to the center of a wealthy family's engagement, Su Wanxing is drawn into a series of billion-yuan credit scams, family inheritance battles, and secret power struggles within the global banking alliance. As long-buried events gradually come to light, she discovers that she is no ordinary girl, but the daughter of a financial queen who vanished many years ago. Her fingerprints can open a mysterious vault, her memories conceal the password to reboot global accounts, and the scar on Lu Chenyuan's chest is linked to a promise the two of them failed to fulfill fifteen years ago. When two supposed heirs appear at the same time, a mysterious child from the future arrives, and all the world's wealth vanishes overnight, Su Wanxing has no choice but to take on the Black Gold Council, which controls the global financial order, with nothing but an old passbook holding just three yuan and fifty cents. In the ultimate gamble of love, wealth, and fate, Lu Chenyuan may be willing to give up his entire banking empire, but he will never allow Su Wanxing to disappear from the account of his life.
