Nelly, a third-class cupid, is forced to take the 'Eros Test,' which opens once every thousand years! To pass the test, Nelly descends to the human world and encounters her assigned human, Go Min-beom, through a fated accident(?). Nelly tries to find him his destined partner! But this man... claims to be 'voluntarily' celibate and says he doesn't need a destined partner. To make matters worse, Nelly accidentally shoots Go Min-beom with an arrow of 'lust' instead of an arrow of 'love,' and now she must struggle to prevent failing the test...!