ch 89 - 90:

MC was summoned by the king, but at the audience he was attacked by the king without reason and almost got his family killed.

(it is later explained that he was attacked for gambling show between nobles, while showing the power of ronin / wanderer).

after successfully repeling the attack, MC threaten to strike back, but the princess tries to make a deal while threatening the life of the MC wife family (while one of MC harem goes in heat wtf) to exonerate MC from the crime of self defence by gifting her something she can brag to other nobles (wtf).

the MC accepted the offer because he didn't want his wife family to be attacked by royalty and didn't want to get into more trouble.

while giving the gifts, for some reason a canyon collapses and blocks the way to the salt producing town causing a crisis in the country, then the princess asked MC to help solve the problem while saying MC is a subject of the kingdom (where not involved in more trouble goes?) and by getting the king bow his head and princess giving puppy eyes, MC naively accepts to solve problems (there is a difference between being kind and being naive).

MC reasons to accept it because MC is afraid that the people of the kingdom will resent him for not solving the crisis, (common sense where are you???, it's natural if MC doesn't want to help the kingdom that almost killed him and his family just for fun.)

and this sentence "見れば国王陛下は人の良さそうな普通のオッサンっぽいし" the person who wanna kill you for fun & gambling is a normal good guy?, don't say it's the nobles who gamble not the king and the king just is the queen puppet, the king approve it so it's the same.

(ch 91)

while the queen trying to flirt with MC & try to kiss him (king is *profanity-genre-ed), she was asked about the knights who were killed in a gambling show, she says it was an honor to die while protecting the royal family, even it was caused by a joke.

(ch 113)

there's another transferred person, just like MC he got into the bad side of royalty, the difference is he successfully ran away by making the emperor collapse, threaten to burn down the castle, and he fled to a border town so that the emperor could not send a large army that could cause war between countries.

well, this transferred person has common sense, because he knows how to use his knowledge and strength when he wants to escape, unlike MC.

(inconsistent stories)

in ch89 MC got letter of letter of apology from the king that says "other noble won't be able to interfere",

but in ch113 when he try to recruit another transferred person, it change into "because I have received a letter of exemption from the king, I can get rid of the nobles".

non-interference become free to kill card?

yeah I love reading isekai slow life novel, but it become frustrating when MC doesn't have common sense, and inconsistent stories.

maybe if it was reincarnation or MC isekai-ed from pre-ww2 era I can accept it,

but this 40-yr old MC that get isekai-ed from modern world lost his mindset and common sense in less than a year (ch 112 says 7 month passed).

The main character, a Japanese man transported to Isekai, discovers that he can order things from a Japanese internet store called Shangri-la, by exchanging Isekai products or gold into credit that he can use to buy almost any modern product, tool, vehicle, or food, except weapons or dangerous goods that are restricted by law in Japan. Using this skill, he becomes a successful merchant, saves important people and gains their favor, goes on adventures, and develops his own territory while accepting refugees.

I read the author's novel raws using Google Translate from Japanese into English, so my understanding may not be accurate. In the first part of "Inventor King", the Japanese main character is transported to Isekai, becomes a high ranking leader just below the queen in an Isekai nation, supports an orphanage with refugee children from different nations, invites refugees and s*aves of different races to his nation and ideally treats all races equally, and defeats an aggressive empire to save smaller nations. He is like your typical good hero who can inspire you.

However, I was extremely shocked when suddenly in part 2 of "Inventor King" the hero completely transformed into an extreme racist. It was very disturbing to find out that this person became God's representative and guides the main character of "Mail Order Life" at the end of the story.