In Seoul's affluent district of Gangnam, a severe heatwave has changed the currency of cool: access to air conditioning now defines the line between the haves and the have-nots.

In Seoul's affluent district of Gangnam, a severe heatwave has changed the currency of cool: access to air conditioning now defines the line between the haves and the have-nots.

SEOUL, Aug 4 — In Seoul’s affluent district of Gangnam, a severe heatwave has changed the currency of cool: access to air conditioning now defines the line between the haves...