When his father falls ill, young coffee roaster Zhou Yi takes over the family's traditional roasted-goods shop, which is on the verge of bankruptcy. Determined to revive its reputation, he sets out to combine scientific temperature control and coffee-roasting data curves with the shop's traditional cast-iron wok. However, a series of obstacles soon arise: the contemptuous mockery of an established rival shopkeeper, the scheming and unreasonable demands of suppliers, and his father's stubborn adherence to old-fashioned methods. With a three-day wager on the line and the entire old neighborhood watching, can Zhou Yi use coffee-roasting standards to precisely control the heat and overcome quality challenges? The fate of the old family shop hangs in the balance.