That night, Hyojin couldn't sleep. His thoughts kept returning to that tune—and the girl who used to hum it.
He opened an old notebook from high school. Scrawled across the margins was a rough transcription of that very melody.
Rain.
Hallway.
A voice that hummed to herself like no one was listening.
She never saw him then. But he remembered everything.
Meanwhile, Jang Ah sat in her apartment, sketching nonsense in her notebook. Faces, flowers, fragments of music.
Something about today's duet unsettled her. The way he looked at her when she played that tune.
"Have I met him before?" she whispered aloud, chewing the cap of her pen.
Back at school, the music professor was watching them from the hallway earlier.
"Interesting pairing," he murmured to himself. "Very… unfinished."
The next morning, campus was buzzing.
"Did you hear about the duet?"
"Those two? Oil and water!"
"Or fireworks."
Jang Ah ignored it. She had headphones on, music blasting, but the questions kept looping in her mind. Her steps led her to the practice room earlier than usual.
To her surprise, Hyojin was already there.
"I thought you didn't do mornings," she said, raising an eyebrow.
"I don't. Couldn't sleep."
They both hesitated.
She pulled out sheet music. "Want to run it again?"
He nodded, sliding onto the bench beside her.
The music began. This time, smoother. As if their minds were less distracted—or maybe more aligned.
When the melody came again, the one from the rain, she noticed his flinch.
"Okay, spill it," she said, stopping mid-phrase. "Why do you look like you've seen a ghost every time I play that?"
"I think you were the ghost," he replied, so quietly she almost didn't catch it.
Their eyes met. And something shifted.
Not a confession.
Not yet.
But something unspoken hung between them like an unresolved chord.
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Lunch was supposed to be a simple truce.
But between awkward silences and half-remembered glances, old memories began to surface—
Pieces of a past neither wanted to face.
Who is Jang Ah really?
And why does Hyojin's heart skip whenever she's nearby?
The truth is closer than they think—
And once uncovered, nothing will ever be the same.