Xiao Zhang, a 25-year-old programmer, finally died suddenly after working overtime for a month. According to Xiao Zhang's direct leader and the company's technical expert Liu, Xiao Zhang was participating in the development of the new version at that time. In order to go online in front of his competitors, the entire team did not have a rest for more than a month. Logically speaking, the team is older than Xiao Zhang and has poor health. Why did he die suddenly? After thinking about it, it can only be explained that: First, Xiao Zhang has too many code bugs, he has too much energy to change it himself, and second, the product manager's needs are too complicated to change it.