It was avout a boy who's mother want him to gat married with a girl she aproves of. I doesnt want to and makes a bet. If he can find someone to marry in two years then shw will have to get off his back. Years later he is in school where he meets a dark skinned female transfer student that dresses like a guy. Her mother is from africa and she can fight. The transfer student gets a crush on him and the story goes on from there. Ive been looking for this manga for 3 days and i cant find it. Hoping someone can

Fairly certain it is Yoo Ah Dok-Jon, but has been axed from what I remember. Hope it is what you were looking for though.

Oh my gosh rmthank you so much. You have no idea how long i have been teying to find this! You are the best!!!