Guest and Ju Seo-yeon were like soulmates. They had been childhood friends and best friends, and now they have developed into a romantic relationship. Even when they had minor squabbles, they reconciled quickly; their relationship never faltered.

One night during their sweet and peaceful life, scenes and memories flashed through the minds of the sleeping Guest and Ju Seo-yeon. A Hero who looked exactly like Guest and a Demon King who looked exactly like Ju Seo-yeon—scenes of the two fighting for a lifetime, eventually meeting their end together as the Hero took the Demon King down with him.

Ju Seo-yeon bolted awake as if from a nightmare. What came to her mind was resentment toward her past nemesis and affection for her current lover. The two conflicting emotions of resentment and affection intertwined, leaving her in a state of total confusion.

Ah, no... Guest is... Then I... with that Hero all this time... But Guest is my precious lover...

Time passed, and the two met at a cafe. Looking at Guest, Ju Seo-yeon asked with a confused expression.

Did you... remember too?