Faced with complaints and an accident, Lee Hong-jo investigates an ominous temple, coming up against the mysterious — and cursed — Jang Sin-yu.

Now in possession of the enigmatic box, Hong-jo finds that opening it is not as easy as it seems. Sin-yu later asks Hong-jo for a favor.

Desperate for love, Hong-jo wonders if her spell was a success. Sin-yu later brings Hong-jo along on a trip for a spell of his own.

Faced with a mix-up, Sin-yu asks Hong-jo to reverse a spell. After coming to Hong-jo's rescue, Sin-yu remembers a clear moment from the past.

Sin-yu finds himself unable to resist the desires of his heart, but a third party complicates the matter. Hong-jo pursues a romantic interest of her own.

Amid a budding love triangle, Sin-yu struggles to remember what happened with Hong-jo. A much-awaited reversal spell doesn't go as planned.

The love triangle intensifies as Sin-yu and Kwon Jae-gyeong vie for Hong-jo's attention. An unexpected person begins to make Hong-jo uncomfortable.

Hong-jo decides to put up boundaries with Sin-yu. But after she encounters an unsettling situation, he comes to her aid.

While Hong-jo and Sin-yu both experience illnesses, a sinister plot forms in the dark. Later, they share a tender moment of connection, present and past.

Sin-yu makes a decision after remembering his past, making things harder for Hong-jo. As everything falls into place, an evil plot goes into effect.

Hong-jo experiences a vision after Sin-yu rescues her from a dangerous situation. Hong-jo discovers the true reason behind Sin-yu's worsening symptoms.

Upon realizing the truth about their history, Hong-jo takes distance from Sin-yu — until a frightening incident brings him closer to her.

As Hong-jo navigates a devastating situation, her past life with Sin-yu comes to light. But just as the worst seems to be over, a threat remains.

Even with their relationship solidified, Hong-jo and Sin-yu meet resistance from his father. Hong-jo confronts Yoon Na-yeon about their past.

Clued in on her next threat, Hong-jo goes head-to-head with her stalker. Hong-jo and Sin-yu make a momentous decision about their future.