A young couple in their 30s, surnamed Lee and Park, exhausted from enduring persistent noise from neighbors above, is hunting for a new place to live. But even as they search, they are hesitant. Moving into another apartment means facing the same uncertainty: Who lives upstairs? What kind of neighbors will they encounter? Their concerns reflect a common dilemma in South Korea, where apartment complexes dominate urban living, making up 62.9 percent of all housing types. Living in high-rise apartm