Seoul, South Korea — Lee Jang-mi, a 34-year-old Seoul office worker, laughs with a hint of embarrassment as she acknowledges fitting the stereotype of a single, childless South Korean woman. “I’m one of those people who doesn’t want kids,” says Lee with an exaggerated grin, rolling her eyes and gesturing toward herself. Though she’s currently in a relationship, Lee is unmarried and hesitant to start a …