九尾の狐は、死を招く仙人を愛した

A lowly fox demon is sent to get close to a mute immortal lord as a spy. What she uncovers: he's been cursed by his own sister — if he ever falls in love, he dies. Only her blood can save him. And someone is counting on her not to try... Will she sacrifice everything for a man she was never supposed to care about?