It's been awhile since the breakup. The couple seems like they have gotten over it but when they met again by coincidence, they realized maybe they are not so over each other.

He left her, but he still loved her. Why did he leave her then? 

CHARACTERS:

Sung Yoomin

She still loves him, even though he left her. She had been getting over him but then he appeared in front of her again.

Nam Woohyun

He still loves her, but he had to leave her. She invaded his mind ever since he first saw her. Now that she appeared right in front of him again, his heart is wavered.