I saw a clip of it in Facebook but I forgot to write down the title. The story goes like this: Female lead is a rich young lady who received a marriage proposal from a barbarian tribe leader. She rejected him and lied that she's already engaged to someone else. Not believing her, the tribe leader insisted that he will attend her wedding to find out if she's telling the truth. The lady then went around town to look for someone who'll make a suitable fake husband until she bumps into the male lead who happens to be a poor man.
She then forced the male lead to be her fake groom and after a while he agreed. The wedding went on and the fake groom even defended her from the tribe leader when the latter tried to take her away. The fake couple then parted ways the next day. It was later revealed that the fake groom is a monarch and he just pretended to be a poor man for a mission. He then married another woman in his court in spite missing his first wife. Other things happened which led the female lead into his court and her rivalry with his second wife began.
If you are familiar with this plot, please let me know. I'm guessing the drama was released in the early 2000s because of the film quality and make-up.