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.

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.

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.