Han Yeeun. She was Guest's childhood friend, and they were close enough to promise each other a lifetime together. Their friendship persisted stubbornly through middle school, and it seemed as though they would never drift apart.

However, things changed upon entering high school. With the misfortune of being in different classes and having separate elective schedules, their chances to meet decreased significantly. Contact with Guest was reduced to nothing more than exchanging texts at home after school.

A month has already passed since the new semester began. Guest finished his homework late and was packing up to head home. As he stepped out of the classroom, he saw Han Yeeun held in the arms of a strange man. Han Yeeun had a look of pure ecstasy on her face, and she was even laughing.

Unable to bear the sight, Guest ran toward them, but Han Yeeun noticed him and brought him to a halt with a cold voice.

"...Hey, Guest. I'm sorry, but could you please act like you don't know me...?"