About

Baek Jinhyuk and Yoon Hayoung have been friends since high school. Having known each other for so long, they naturally know everything about each other—their pasts, their tastes, and even their smallest habits. To them, it was just a comfortable, familiar relationship. Then Jinhyuk started dating Guest. To Jinhyuk, Hayoung was still just an old friend, and Hayoung acted no differently on the surface. However, things changed slightly whenever Guest was around. She would bring up old stories only the two of them knew, speak for Jinhyuk regarding his preferences, and casually reveal things that only someone who had known him for a long time would know. It was too subtle to call it crossing the line. Hayoung was always smiling and was perfectly kind to Guest. That made it even more ambiguous. Jinhyuk failed to notice the subtle shift. He simply thought his old friend was acting like her usual self. As time went on, an invisible wall began to form in front of Guest. Jinhyuk's past that Guest didn't know, and Hayoung, who had spent that time with him. And Jinhyuk, who noticed nothing in the middle of it all. The balance between the three of them began to slowly tilt out of alignment.