Read from Chapter 1-37 (Translated)
Plot:
A reincarnated hero who want to live a peaceful and uneventful new life and hope no one bother him or force him to do anything ever again, but that not going happen as he hope when you born in a house of nobility with the issue of successor and their family reputation as a house of skilled swordsman. So you can say the plot go like this; if there an issue that threaten MC peaceful life, he will take care of it in a behind the scene way and he not afraid to spill some blood to do it while remaining as a lazy person in the eye of other.
Main Character:
A reincarnated hero who now the third son of a noble family who well know for their swordsmanship in the kingdom.
What we the reader know/or should know about his former life as a hero:
-We know our Main Character is a modern person with modern knowledge (21th century).
-We know our Main Character was select/chosen/forces into as a hero to fight the demon lord and it' armies.
-We know our Main Character hated his titles "Hero" and it burden that come with it, he was never were happy while being a "Hero"
-While being a "hero" he was forced/demanded to do unreasonable task
-He only felt a moment of happiness when he die after he killed the demon lord.
What we the reader don't know about his former life as a hero:
-Was he summon to another world as a hero?
-Was demon appearing in the modern world and he was chosen their in the modern world as a hero?
Now about the current Main Character status quo:
Our Main Character main goal in this life is to live in a peaceful and uneventful life and not bother by anyone. Reason why is because his past life as a hero who was force to do unreasonable task while the people to give the task do nothing while saying it for the people or god. This give him a deep hatred of people in power because he was used as a "tool" in a dangerous environment while they remain safe and gaining more personal power in their standing.
Our Main Character retain his past life memory and his former hero experience in using weapon (mainly sword and knife). Our Main Character want to enjoy a carefree life so he act carefree and lazy so he can be ignore by other people. If they think you are useless then they ignore you and never ask you to do anything; that how our Main Character is in solving most of his minor problem. If an issue threaten his uneventful life, then he will have no problem eliminating or kill the threat while doing it in the shadow or behind the scene (doing the task without people knowing it him). He don't want to stand out because if he stand out, they will have expectation and force him to do other thing.
Our Main Character sometime get mentally frustrated by his surrounding and expose himself (show a bit of his power) in a restricted manner only in front of people he trust while taking care of the rest. He would prefer to be a bystander then anything else.
Reply to [invinciblegod] comment on these three word in my opinion: evil, selfish, and childish.
Selfish: Isn't that almost everyone like that in some way in almost every character?
Childish: A little bit but only in situation where our Main Character describe as enjoying a drama scene.
Evil: The definition of evil in that world would be different from the modern way of thinking. And killing is normal in that world as long as it not counted as murder. Of course everyone (reader) have their way of thinking. I just saying this so other reader who have not read this novel yet would not be misinform and let themselves be the judge. Some people may judge it as bad but not evil while other will judge it as necessary evil, I just saying.