During a scorching heatwave with temperatures reaching 44°C, Lin Fei, a top-performing saleswoman, returns home suffering from heatstroke and tries to turn on the air conditioner. Her stubborn father-in-law obstructs her at every turn, welding the power switch shut and cutting the fan's wires. Her husband, Li Dahai, and her younger brother-in-law side with him, accusing her of being spoiled and wasteful. Heartbroken and disillusioned, Lin Fei decisively divorces her husband and leaves the Li family. Armed with an air-conditioning marketing strategy targeting lower-tier markets, she joins Gu Group, rises through the ranks to become a division director, and launches a thriving career.