A Cupid deals with all types of love. A Grim Reaper leads soul to the afterlife. Yet somehow the arrival of a mortal being claimed as the one and only Cupid Reaper named Serena emerges with the dual role of both a Messenger of Love and the Caller of Souls. Serena's tripartite life soon unravels inadvertently when she accepts her own fate while changing her own destiny throughout the process of her supernatural duties.

Serena's life soon gets complicated when another human being with a sixth sense by the name of Hyungwon is able to see her in both supernatrual forms. Yet somehow he's unable to read Serena when she's just her human self. On top of that, Serena's next assigned charges become unknowingly connected within her human and supernatural forms as they all continue to forge their own path in life.