The only thing I know about Korea is what I've seen in documentaries or read, and I've seen a lot about the great mental pressure both in studies and at work, well, you said it yourself, the pressure is so strong that socially it has broken all biological instincts for reproduction. I also know people who said they wanted to have children but in the end they didn't even take care of them; here in Latin America, paternal abandonment is very, very common, sadly.