Generally, dreaming of fire or fire is a symbol of a person's inner desires, especially sexual desire or "anger" in interpersonal relationships. Fire or fire is a hidden desire in your heart, which you don't usually show, but a desire you want to try. Only people who have been troubled by it will dream about fire or fire before and after solving the problem.
As for the man on fire in your dream, it is a sign that there will be a happy event in the near future.