I realized this accidentally there this Korean movie called Blu butterfly Amazon the main actress name mentioned in the movie is Yoo Mi,but there is this another Korean actress called Kim min gyung aren't this two actresses are same.maybe I am wrong.thank you

Welcome to the forum. You are not wrong, Yoo Mi is indeed an alias of actress Kim Min-gyung, it's one of the many updates that was on my to-do list. You did a good job spotting it, as even the KMDB hasn't yet realized that Yoo Mi is an alias for Kim Min-gyung and has them on separate pages

The credit on Blue Butterfly The Amazon [1984] on HKMDB had been mixed up with another Korean actress who also uses the stage name Yoo Mi, her birth name is Lee Keum-seon. So I have moved the appropriate aliases to Kim Min-gyung's and have corrected the film credit and images, I also added a higher quality pic of the Korean poster for Golden Rose [1971] since I was using it to check for her name .

Kim Min-gyung (aka Yoo Mi)
https://hkmdb.com/db/people/view.mhtml?id=5585&complete_credits=1&display_set=eng

Yoo Mi (aka Lee Keum-seon)
https://hkmdb.com/db/people/view.mhtml?id=80843&display_set=eng

Since this was quite a simple update to do, I did it now rather than wait till I'm back.
Cheers