I made a mistake when working in a hotel and forgot to refund a guest’s deposit. I was greedy and the guest came again later. What should I do?

Judging from your description, you still have some evil intentions. You dare to be greedy for such money, which means your emotional intelligence is not very high? What can be done perfectly, even if it is really not discovered by others, can you live up to your own conscience? Is this the kind of money you should earn? Since you have raised such a question, it means that the matter has reached a point where it has to be solved. It cannot be said that you have woken up on your own. At least now you have realized the seriousness of the mistake. As long as you bravely admit the mistake and don't hide it, you will also Live up to your own conscience, and others will understand you. This is the best solution. If you still use strong words, it will only make it darker and darker. I think the impact on your future development and your personality will be immeasurable.