I remembered watching it like 10 years ago or so. The story was starting with a lady that is very good in riding horse and fighting. she was the second daughter from a high-level family (if i am not wrong is general). she met a guy one day and felt in love. the guy went back and told his elder brother bout the girl. too bad, the elder brother was the king of china and took the lady as his concubine. I remember the king also took her elder sister and younger sister as his concubines. the third sister was afraid of thunder.
that's all that i remembered. i tried to search via google without any result..