The ache of loss for Koo Yeon-jun remains a constant companion to Han Jun-hee. On her birthday, the arrival of an anonymous bouquet stirs within her a peculiar sense that the memory of her departed lover lingers close.

As she delves into the mystery of her double, Jun-hee receives an unsettling package. Meanwhile, Kwon Min-ju finds herself forging a friendship with the object of her affection, only to be met with profound disappointment.

Jun-hee struggles to disentangle Min-ju’s fragmented memories from her own. Meanwhile, Nam Si-heon witnesses an unexpected depth within Min-ju's character.

Lost between waking and sleep, Jun-hee grapples with the blurring lines of reality and dream. Then, an antique diary surfaces, its pages holding a revelation that shatters her perception of everything.

In 1998, Jun-hee’s effervescent spirit seemed to radiate through Min-ju. Those around her took notice, and among them was a watchful presence – a figure who observed her from a distance, shrouded in an air of mystery.

A quiet fascination has taken root in Si-heon for the newly arrived Min-ju. This burgeoning attraction complicates an already delicate situation, deepening the threads of a love triangle that threatens to unravel. The decision to confide in…

Jun-hee attempted to caution the boys about the impending peril. Simultaneously, a dreadful occurrence unfolded at the school during the night hours.

Finally, Yeon-jun reaches Jun-hee. He attempts to captivate her with every means at his disposal, yet the path to love proves far more intricate than he imagined.

Jun-hee and Yeon-jun bask in a period of contentment. Elsewhere, Si-heon navigates a relentless succession of difficulties.

Driven by a fierce determination to alter what was, Jun-hee resolves to save Min-ju. Meanwhile, as Si-heon delves deeper into the investigation of the murder, he uncovers a deeply unsettling truth.

Min-ju deliberately ignored the looming threats, her attention fixed solely on her time with Si-heon. Yet, Si-heon and In-gyu began to harbor a growing unease, their perceptions subtly shifting towards suspicion.

As Min-ju wrestles control of her fate, Jun-hee makes one final plea. Afterward, she and Si-heon resolve to mend what has been broken.