“Heat exhaustion (일사병, 日射病)” and “Heat stroke (열사병, 熱射病)” used to be common summer ailments, but they are rarely seen today. In contrast, the number of people suffering from “Air conditioner sickness (냉방병, 冷房病)” has been on the rise. This marks a shift from nature-induced illnesses to those brought on by artificial environments, highlighting a paradox where scientific progress turns nature on its head.