Here's why:
* It's a generalization: Assuming someone's ethnicity based on their appearance is inaccurate and can perpetuate stereotypes.
* It's potentially hurtful: It implies that there is a specific "Korean" look, which isn't true.
* It's unnecessary: It's generally best to avoid comments about someone's ethnicity or physical appearance unless it's directly relevant to the conversation.
Instead of making comments about someone's appearance, try focusing on their personality, interests, or other aspects of their identity.
Here are some alternative ways to phrase what you might be trying to say:
* "You look very familiar. Have I met you before?" (This focuses on a shared experience.)
* "You have a very friendly face." (This is a compliment about their appearance without mentioning ethnicity.)
Remember, it's important to be respectful and mindful of others' feelings when discussing sensitive topics like ethnicity and appearance.