The purpose of a Will is to ensure that your family is taken care of, and that your assets are passed on to the people of your choice.
You should highly consider writing a Will if you:
have children or pets who depend on you;
have assets worth HK$100,000 or SG$17,000 or US$12,000 or above;
have items or lump sums of money that you want to give as gifts;
have someone you want to exclude from your estate.