I actually died...
I was already dead when I was in the prime of my youth! It's a bit hard to accept though.
The fact that I am dead is something that I pondered for a long time before realizing based on the current situation. I went to work and went home to eat and sleep in a daze as usual, but why did I, who should have been lying on the bed in my rented cabin reading useless novels and spending the day in a wasteful way, stand blankly in a dark and cold place when I opened my eyes. There were many people around me, but they all looked the same. I stayed here confused for a long time before I realized what the situation was.