“Have you ever heard of memento mori?” “It means that you should always remember that you too will die someday.” When I was in high school, I was in love with a mysterious girl. She seemed cold but also thoughtful at the same time, and she seemed to be smart yet somehow a bit goofy at times. She had many secrets and she never told me what those secrets were. When I told her, , she welcomed me and we made many happy memories. Until a car accident took her away from me. And 10 years later, I found myself being a teacher. Maybe it was a cruel twist of fate, but on the first day that I have been assigned to my alma mater, I was heading towards the old school club room where I used to hang out after the day was over. [……Not a thing has changed] As I turned away with some tears running down my cheeks out of sentimentality, “Are you heading back already?” ……Suddenly, I heard a voice that I have missed for so long. When I looked back, I saw her looking the same as she was 10 years ago, but now, she was a ghost.