My Sister Took My Place as Crown Princess, So I Took the Imperial Edict and Became Her Mother

I was the Crown Prince's long-awaited Crown Princess, but on my wedding day, my legitimate elder sister drugged me unconscious.

When I opened my eyes again, I was a palace beauty, while she had taken my place as the Crown Prince's bride.

I knelt and knocked my head against the ground at the entrance to the emperor's bedchamber for three days and three nights. At last, His Majesty granted me the honor of marrying the Crown Prince as his secondary consort.

My sister, meanwhile, was convicted of deceiving the royal family and sentenced to exile on the frontier.