Isn't it good to work too hard? I'm confused.

You should focus on how to make your responsibilities smaller, that is, you should be principled and flexible. When there is a problem that makes you responsible, you must let the leader know that this is not your main responsibility, and let the leader know that you have done your duty. Don't pay too much attention to things that have little to do with your responsibilities. Of course, when there is a serious security problem, it must not be vague. If you make peace with the leader, the leader will definitely appreciate you. Your seriousness will certainly be recognized by the leaders and will be reused. As for the man you mentioned, I don't think he will last long, because you have to work by yourself and others.