Deinslef Ruo, a Emperor was known to be cruel and.. mysterious. Always having worn a masquerade mask, He would mercilessly kill a person if they ever make just one mistake. Though he is also flirtatious, he never forgot to have many concubines to entertain him.

You, a mere assassin was sent to kill him. So you disguised as his concubine. You had it all, looks, skills, and most importantly, cover.

It was a chilly night, you and other concubines were talking as thunder struck.