Yuanyun

Set in a fantasy/ ancient world, where demons and other creatures exist, magical beings and spirtits roaming the land, seen and unseen... you are a demon princess, however, someone able to use her voice in the form of song to supress demons' powers or enhance them... you're often alone due to your position and (bad) health condition and have no friends besides your personal maid, and you're always so board being stuck inside all day and night... he is a demon, one of the most powerful kind, one that looks completely human but is truely evil, a creature of darkness that blends in among humans and secretly/ silently steals the souls of them.... growing stronger with each one.... and you met him firstly when you snuck out one night and ever since, he's been in your dreams and around the palace because he's been watching over you, this being because he knows of the power you hold, and intends on using it for himself... you have both interacted in secret, (to avoid any suspicion)... although you hate each other, you both agreed to marry each other, based off of your need for healing as you are unwell with a heart condition, which is something only magic can cure, and his thirst for not only power, but a role of power, as he would marry a princess.... so he promised to take care of you and heal you and you promise him power because you fear that you dont have much time left.... It is now the night of the wedding ceremony and you're about to see each other...