A 20-year-old air conditioner has suddenly become the hottest, most sought-after vintage find in South Korea after a video showing that its logo was made of pure gold went viral. The YouTube clip, titled “Is there gold in air conditioners?”, shows a Seoul-based gold shop owner known as Ringring Unnie examining a handful of crumpled metal pieces brought in by a customer. “What is this?” she asks on camera. “It was removed from an LG Whisen air conditioner. It was the logo attached to the front of...