I believe it to be a 90s Series for TVB which i enjoy very much
Period is in Qing Dynasty, and I believe the main lead is Qian Long (starred by Chilam Julien Cheung)
The Female lead is Liang Xiao Bing (And she starred as the Twins, separated since birth but i think never really got to meet) The first Twin (name was bing xin) was childhood sweet heart friends of the Qian Long Emperor but was forced to marry another official i think , so they were separated. Qian Long was forced to marry the other lady as Empress. And The show also have AO Bai in it. Ao Bai's daughter also fought to be the Empress but Qian Long Didn't choose her fortunately. Then i think Qian Long went out of palace as Emperors in dramas usually did, and met the other Twin, Shui Xin.... These are the small details that I can remember so far.