I was out of this genre for a while, so I decided to ignore the BL tag and try this...
I didn't even get to any BL, its just like the slowest version of all the "I want to live slowly after being a hero etc" stuff.
Got a feeling this one is focused more on the relationships of the mc and ml, rather than dungeon stuff.
Then again, dropped after a few chapters. So, if you like slow stories, give it a read. If you came here for system/dungeon break action... its there but... meh