I am happy because of I do not worry about the problems. Solve the problem is my jobs, if i don't have the problem, i don't have job. I receive the problem every day from the users. Whenever there is a problem, I will find out the real cause of the problem, and then fix it. I am so happy every time when I have the problem and can fix it. I think the users are happy too. This is the reason why I always enjoy it every day.