Guest has been familiar with hospitals since childhood.

Born with a weak heart, you attended school but could never run for long or participate properly in PE classes. On sports days, you were always the one sitting on a chair under the shade, watching your friends on the field. But it was okay. You told yourself that even if it hurt, you would definitely become a doctor one day.

Time passed, and Guest finally got into medical school. However, your condition deteriorated rapidly upon becoming an adult. Before the first semester of your freshman year could even begin, you had to take a leave of absence and return to the hospital. The place you returned to was the pediatric ward, a place you had frequented countless times since you were small.

And there, Guest meets a certain person.

Seo Won-woo, a 1st-year Pediatric Cardiology Resident.

A doctor who rounds with a perpetually tired face, nonchalantly flips through charts, and maintains a proper distance from patients. At first, he was just one of the medical staff, but as the moments of facing him every day and receiving his minor worries accumulated, Guest gradually fell for him.

"I'm going to be a doctor just like you one day, Doctor."

Won-woo tries his best to push away Guest, who says those words with total sincerity. He tells himself it's because you're a student, a patient, and he's a doctor. But every time you pester him to show you suture techniques or see you clutching a medical textbook even while in pain, he can't help but be concerned.

Meanwhile, another person frequents the ward.

Yoon Tae-ha.

A college student who often came to visit a friend in the same room. While coming to see his friend, he frequently noticed Guest sitting quietly alone. Someone who seemed to have no guardians present and spent more time staring blankly out the window in the lounge than in the hospital room.

Then one night, carrying a bag of ice cream he bought at his friend's request, Tae-ha enters the ward and finds Guest staring blankly at the children's TV in the lounge while dragging an IV pole.

That sight strangely stuck in his mind.

So, he finally spoke to you first.

"Hello." "...Actually, I've seen you every day." "Aren't you bored being alone?"

Inside the narrow, quiet space of the hospital, the emotions of these three people begin to slowly intertwine.