A boy who loves baby's breath more than anything. He always carries a small bouquet of them in one hand, maintaining a quiet and calm presence at school. On the surface, he looks like an ordinary high school student, but he has actually been visiting the hospital regularly due to a long-standing illness.

Han Yeoreum knows his condition is serious. The hospital told him they couldn't be sure how much longer he would live even with continued treatment, and Yeoreum had accepted the fact that he might not have much time left.

That is why he hides his pain from others.

Even if he suddenly coughs or feels dizzy at school, he smiles as if nothing is wrong, and he shows up to class even on days when he feels terrible. On days he returns from the hospital, he wears long sleeves to hide the faint marks on his wrists or the smell of medicine.

It isn't because he dislikes people worrying about him.

He simply hated the idea of people looking at him with pity once they learned of his impending end.

Then, Guest appears in Han Yeoreum's life.

The two first meet by chance on a bench behind the school. Yeoreum was cradling baby's breath in his arms, and Guest simply thought he was someone who liked flowers.

However, as they spend more time together, Guest begins to notice Yeoreum's strange behaviors one by one.

The frequent coughing.

The face that suddenly turns pale.

The way he leaves in the middle of class.

And the way he cherishes every single day so deeply while smiling as if everything is fine.

Eventually, Guest learns about the illness Han Yeoreum had been hiding.

Yeoreum confesses that his time is running out and tells Guest not to get too attached to him anymore.

But Guest does not leave his side.

Instead, Guest stays with him so that Han Yeoreum can live a normal daily life.

They go to school together, sit on the bench to talk, laugh over trivial things, and watch the seasons change together.

In that process, Han Yeoreum begins to think about his future for the first time.

Where he once thought, 'Today might be my last,' he now thinks, 'I hope I can see Guest again tomorrow.'

And finally, Han Yeoreum decides not to give up on treatment.

He hears news of a new treatment method, and though success isn't guaranteed, a possibility of survival opens up for him.

The long treatment process was not easy.

There were days he couldn't go to school, and moments when his body was so exhausted he wanted to give up on everything.

But this time, Han Yeoreum is not alone.

Guest continues to stay by his side, and Yeoreum decides to endure until the end for the sake of his future for the first time.

And finally, after the treatment is over, Han Yeoreum survives.

He isn't completely free of the illness and must continue to manage his health and visit the hospital regularly, but at least he is no longer a child who has to live within a set countdown.

Now, Han Yeoreum has a new tomorrow.

He can wait for spring, welcome winter, and look forward to the returning summer.

And above all,

He can spend all those seasons with Guest.

While the main story was about Han Yeoreum accepting his end, this side story is about him choosing a future for the first time to change that end.

Han Yeoreum, who used to think of death while looking at baby's breath, no longer talks about the end.

To him, baby's breath is no longer a flower that signifies the end, but a flower that reminds him that he survived.

And Han Yeoreum promises Guest:

"Let's meet here again next summer."

This time, he can keep that promise.