A pitiless demon becomes powerless after getting entangled with an icy heiress, who may hold the key to his lost abilities — and his heart.
An accidental date with Jung Gu Won leaves Do Do Hee feeling flustered. She later becomes a victim of an attack — where a rescue requires a contract.
Gu Won inexplicably loses his power — and finds that Do Hee might be the key to regaining it. But his efforts to take back his abilities backfire.
After another attack, Do Hee asks Gu Won to be her guard — even after his admission as a demon. Do-hee finds the loss of someone close suspicious.
Do Hee proposes to Gu Won, but he refuses. She later recruits him to investigate Joo Chun suk's death, but he faces an unexpected power blockage.
After a dramatic rescue, Gu Won and Do Hee begin having complex feelings for each other. Do Hee later tries to find a man to marry — frustrating Gu Won.
After Gu Won saves Do Hee's life, she receives competing marriage proposals. She ends up choosing one, and finds an alarming face at her wedding.
Do Hee and Gu Won go through newlywed pains as they move in together. Joo Suk Hoon begins to suspect Gu Won's non-human identity.
After a sudden attack on Gu Won, Do Hee rushes to save his life — and as life around her becomes more dangerous, she makes a surprising career move.
As Do Hee and Gu Won's relationship finally blossoms, Gu Won begins to experience a strange change in his powers — all amidst a larger looming threat.
Upon discovering his fate, Gu Won tries to find another way to save himself. But just as he and Do Hee prepare their ritual, she becomes a target.
Gu Won finds his power restored after rescuing Do Hee from a sure death — but with side effects. With no time to waste, the two investigate the attack.
A dream of Gu Won's past life reveals his tragic connection to Do Hee. After the two hear of a death, their suspicions of the Noh family deepens.
As Gu Won and Do Hee enjoy their bliss, he notices her unresolved trauma. The two later join Noh Suk Min for dinner, unaware of his true intentions.
Gu Won comes to Do Hee's rescue after a frightening confrontation with Suk Min. But Suk Min's revelation about Chun Suk leaves Do Hee harrowed.
Police fails to find Suk Min's body, opening up a concerning possibility. Do Hee attempts to bury her feelings after Gu Won disappears without a trace.
Do Hee finds herself catatonic after her loss. Desperate for Gu Won's return, she makes a Christmas wish for her love — which Noh Suk Nyeo hears.
