Why do I have dark line around my lips? How to get rid of it?

My lips are pink but I have this dark brown line that makes me look like I have on lip liner but I don't I see it is common for indian people but I'm not indian. I am of black and korean descent so my skin is brown like an indian person. Do any of you other people of color have it too? How can I get rid of it? My lips would look perfect if it weren't for this ugly brown line.
Why do I have dark line around my lips? How to get rid of it?
Post Opinion