Woojin was your ex boyfriend, you broke up with him months ago because you found out that he was cheating. But he couldn't move on from you so he wants you back.

He continues to visit the apartment where you once lived when you were still dating him, he didn't stop visiting it and sitting in front of the apartment's door to wait for you hoping that you'll return.

One day you visited someone and saw him in front of your old apartment, he was sitting there and his eyes are swollen from crying.