The Dungeon Masquerade
The planning I put into my life went to waste. I enrolled in officer school, joined the military. After I served my time, I planned to leave, take my government land, and settle with a cute girl somewhere. That was the plan. However, my fellow knights and I went to clear out a dungeon, as is our duty. To pay a life or two was an expected cost, but the deaths of everyone was not. Everyone died. Except for me.
I had alone survived and the dungeon became my prison, my home. The planning I put into my life went to waste, but that did not mean I could'nt start over. So, from the depths of the dungeon, that is what I did: carve out my new life as a dungeon.