"Some emotions lingered around in indescribable forms.
The shape gave off a refreshing green apple scent in the window where warm sunlight poured in,
Underneath the bed at dawn, where cold darkness reigns
It also felt like damp shoes soaked in rain.
The shape was so vague that it was difficult to even determine that it was a fragrance.
It was a smell, but it also felt like a feeling.
It looks like some vague shape
It seemed like an invisible soul.
Or maybe it was a happy memory, or maybe it was a sadness that brought tears to my eyes.
Well, what should I call this?
People of the world seem to call this form longing."

The love of youth burns so easily, and the breakup passes just as easily. At the time, it felt like everything, so heartbreaking and painful, but as time passes, the emotions in our memories gradually fade.
But just because the feelings have disappeared, it doesn't mean the love of that moment has disappeared.

The book “The Borderline of Longing” is a “collection of love emotions” that tightly captures the scenes that a person’s heart has experienced as they loved, parted, and longed for.
The emotions of those passionate days have faded like a film camera, but the traces of emotions from the past that remain faintly are records that are brought out again in the name of longing.
I have calmly tied up all the times I loved and the hearts I had to let go of in a book.

Some emotions lingered around in indescribable forms.
The shape was like the refreshing scent of green apples by the window with warm sunlight streaming in, and like damp shoes soaked in rain under the bed in the cold darkness of dawn.
The shape was so vague that it was difficult to even determine that it was a fragrance.
It was like a smell, or a feeling, or a vaguely visible shape, or an invisible soul.
Or maybe it was a happy memory, or maybe it was a sadness that brought tears to my eyes.
Well, what should I call this?

People in the world seem to call this form longing.

--- p.16

Sometimes I remember myself as a complete planet back then.
I blushed shyly as I handed you a small gift, I reached out my hand, cold from the snowy wind, and then I made that heartfelt confession…
The astronaut who came to ruin my universe, the returned letters sent to the fifth season that will never come again in my life.
The time has come to embrace the sorrowful farewell that began with a passionate beginning.
But if I ever meet you again, somewhere in the universe, will we still be able to trace the same orbit as before?
--- p.50

Eventually, we lost our way and began to wander, and when we lost our destination, our journey came to a standstill.
The granary called our affection soon became empty.
We used to fight and make up right away, but now as time goes by, we fight more often and more loudly and it's hard to make up.
The more I sought advice from others in my despair, the deeper the misunderstanding and emotional rift between us became.
Still, those were the days when I struggled to live, trying not to collapse, not to break, not to disappear.

--- p.89

On the bus ride home, the stars on the ground twinkled on the surface of the sea.
A black sea painting that captures the shadow of the moon and the lights of the city.
I looked at the sea for a long time with a heavy feeling.
Are you also looking at this scenery from somewhere?
No, maybe it's already covered me, and I've forgotten the scenery of the sea.
Am I the only one who misses you?
On the bus passing in front of your house, just looking at your house made the longing subside.
Just being so close, just passing by you, it was reassuring.
So, at that moment, I was under the illusion that I could forget you quickly.
Crossing this long bridge, I was reminded of that arrogant delusion once again.
No, my longing has not subsided.
I still missed you.
I still miss you terribly.

--- p.122