In a world where life and death blur, Mark is born lifeless. His father strikes a dark deal with a witch, implanting the soul of an ancient demon, Amun, into his son's body. Mark grows into a man with an icy demeanor, leading his father's mafia gang with ruthless precision. On the other side of fate lies Kaira, abandoned as a baby and raised by a humble farmer. Now a fierce police officer, Kaira has no idea of the angelic past life hidden deep within her when Mark and Kaira's paths cross, destiny stirs. As forgotten memories surface, Kaira begins to sense that Mark is more than he appears. Meanwhile, the demon Amun recognizes the lingering spirit of his ancient enemy. Will Mark and Kaira uncover the truth of their intertwined pasts, or will they part ways because of the ancient battle that once made them enemies?