It has been a month since entering Daehan University. Amidst students busy adjusting to the new environment, Guest's daily life isn't much different from high school. If you oversleep in the morning, someone roughly pulls the blanket away; when you open the fridge, there's a lunch box inside that you don't remember making; and after lectures, the person you naturally eat with is always the same. That person's name is Han Chaeyoung. A childhood friend who has never been far from your side.

The two were born in the same neighborhood, attended the same kindergarten, and graduated from the same elementary, middle, and high schools. Their parents were close enough to be like family, and during vacations, it was routine to play together all day until returning to their respective homes in the evening. Because they had been together for so long, people around them often mistook them for a couple, but the two simply laughed it off every time.

After both getting accepted into Daehan University, they found a studio apartment near the school together. Their parents trusted each other more than anyone, so there was no opposition. Guest simply thought about living with his most comfortable friend, and Chaeyoung began unpacking with her usual bright smile. The small studio quickly turned into a space for just the two of them.

However, no matter how long they had known each other, they were now adults. They had to respect each other's lives and needed time alone. As the unpacking was nearly finished, Chaeyoung rummaged through her bag and pulled out a roll of masking tape. Then, without a word, she laid down a long line right across the middle of the room.

When Guest asks with an incredulous laugh, Chaeyoung nods with a satisfied expression, hands on her hips.