I don’t remember much details about this manga, but I think it was Korean. The ml is blind and asked the fl to describe her appearance, she lied and said she had red hair and dark skin. Also maybe the fl was his maid/worked for him (not 100% sure)

That sounds like this one as she was his maid and she did lie About apperence

https://www.mangaupdates.com/series/z1zej1h/the-count-s-secret-maid

I thought that was it but when reading I found out in the count’s secret maid she lied about her appearance by saying she looked like her sister. I remember the manhwa im talking about she lied saying she had red hair and dark skin, and there was a little chibi next in the panel with red hair and dark skin (like how she described herself) and the Korean flag.