I think hard-working is a good behavior to make the boss happy.
Usually, people always want to less work but good pay. If an employee works harder than others , The boss will be very happy.If I am an employee, I would be in the office on time each workday, I would be finished the job before the boss asked. I would love to help other employees when they need my help. I would love to spent my overtime to study how to improve the business.It is always not good that when the boss asks you to work then you do not pay any attention. The worse behavior is when the boss asks you to help than you expect someone else to do it or you even don't know how to do it.