***This review may contain spoilers*** It is very scary story. Ithink he was very tired. Maybe, he collects many stresses. Golf course is a institution for many rich people. His job, collecting ball is very scary operation. So, I think because he continues to work excessively, his heart was broken. In Japan, there are many incidents like this story. For example 10 years ago, in Akihabara, the man troubling in his job, kill 7 people. Also, there are many death which is known as "Karoshi". So, I think the government or the company should think about workers more. If there are recreations for workers I think he may not behave like that.