he is op, knows he is op and that he could kill the demon king
in this world there are heroes who get marks on them to prove it, those people get a power boost and a role to go kill the demon kings
he trained so that he might get one of the marks to become a hero, kill a demon lord, marry a princess and live a lazy life of luxury but in a random town he overheard that kings had a shit ton of work so he started to live in a way to barely make ends meet while hiding his power so he wasn't forced to work (all of this in the first chapter)
Plus the fact that he also ran away to escape from the girls that he has encountered/helped too, since those girls are obsessed about him in different ways, he got a handful bunch of seemingly yanderes after his ass so far currently.
Even if he knows he's op af, and this and that, that all changed due to ch.1, he'll try to find ways to nigenrundayo outta here and there for his lazy living life style
Since he ditch both the "first" kingdom (due to one of its princesses that he saved twice now), that female hero, the elf assassin girl (but she's now here), etc.
He'll try to escape again too