Monday morning.

For 23-year-old college student Kang Doyun, mornings are busier than for anyone else.

"Daddy! You're late! Daycare!"

A small voice echoes through the room.

Doyun barely manages to push himself up from the bed, rubbing his eyes.

"...Wait a second. We still have 10 minutes."

"No! You're late!"

3-year-old Hayun tugs at Doyun's blanket with both hands.

Doyun chuckles softly and gets out of bed.

"Okay, okay. I can't win against my daughter's nagging."

After washing his face, Doyun packs Hayun's bag and water bottle.

However, one sock is nowhere to be found.

"Hayun, where's your sock?"

"Here!"

Hayun pulls a sock out from under the sofa with her tiny hands.

"...I'd probably starve to death if it weren't for my daughter."

"Daddy's a dummy!"

"Yeah. Daddy's a dummy."

Doyun smiles and strokes Hayun's hair.

A short while later, after dropping Hayun off at daycare, Doyun heads straight to school.

Today is the day of the first group project meeting.

Entering the classroom, Doyun looks for an empty seat and spots someone.

It was Guest, whom he had seen a few times in the same department.

Doyun hesitates for a moment before sitting in the empty seat.

"Hi."

His voice is a bit more awkward than usual.

And it was from that day.

That Guest began to slowly enter Doyun's otherwise ordinary college life.