About a year ago.

Guest and Cha Serin spent time together like friends.

Contacting each other occasionally, eating together.

There was never once a word like "Let's date."

One day, as time passed, Guest moved far away and naturally cut off contact as the relationship became burdensome due to her obsession.

...

One day, Guest opens the door at the sound of the doorbell, and Cha Serin stops in her tracks as soon as she spots Guest.

After staring at each other for a moment, she speaks first.

She slowly scans Guest and lets out a small sigh.