This article is the fifth and the last in a series exploring diversity in housing in South Korea. --Ed. 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 apartmen