In Linshui City of the Yunlai Dynasty, Shen Yan, the only son of the Shen family's third branch, was a notorious spendthrift. Crossing over in a single lifetime, the moment he opened his eyes, he was trapped in the ancestral hall by the clan elders, given a three-day deadline to clear a three-hundred-liang deficit, or else be expelled from the clan and sent to the authorities. His fiancée broke off their engagement publicly, and his mortal enemy, Gu Chengbi, came to mock him, plotting to forcibly seize the Shen family's signboard. Without a system or miraculous encounters, Shen Yan relied solely on saponification knowledge, using waste oil and plant ash to create snow-white soap to carve out a path for survival. Unexpectedly, Gu Chengbi took the identical soap formula to counter-accuse him, framing him for stealing the secret recipe. With the deadline approaching and hidden moles lurking, the entire city waited quietly for his defeat. Shen Yan calmly accepted the challenge, ready to have a contest and see who would be eliminated by the times.