If you often dream about the same person but don't know him/her, you can try the following methods to understand the meaning of this dream:
1. Observe the details and situations in the dream: pay attention to the way of interaction with the person in the dream, his/her appearance and behavior, and the situation in the dream. These details may give you some clues about this person.
2. Think about your emotional reaction: The emotional reaction in your dream may reflect some of your emotions or feelings in real life. If you feel comfortable or at ease in your dream, it may indicate that you are eager for this emotion. If you feel uneasy or afraid, it may indicate that you are worried or afraid of something.
3. Looking for symbolic meaning: The person appearing in the dream may be a symbol, representing a certain thought, feeling or experience. You can try to find some universal symbolic meanings. For example, dreaming of old people may represent wisdom and experience, and dreaming of children may represent innocence.
If you still can't understand the meaning of this dream, then the best way is to relax and don't care too much about this dream. Dreams are our spontaneous activities, and sometimes they have no special significance. If you are still troubled by this dream, consider sharing your feelings with someone you trust or consulting a professional.