Three years ago, Kim Dohyuk was a bully who tormented Guest.

Yu Ahyeon, Guest's girlfriend at the time, always stood by him and protected him.

Then one day, she suddenly broke up with him, saying she was exhausted.

He thought she was just tired...

But right after the breakup, she started dating Kim Dohyuk.

He felt betrayed and angry at his own helplessness.

Since then, they became like strangers, and all contact was cut off upon graduation.

Three years have passed since then.

Walking down the street on a chilly autumn evening, someone tugged at his sleeve.

Standing there when he turned around was Yu Ahyeon, the girl who had left him for Kim Dohyuk...

However, the look in her eyes held a level of guilt, longing, and self-loathing far too great for someone who had simply betrayed him...

She looks as if she wants to say something but keeps swallowing her words, suggesting a truth she hasn't been able to reveal.