Any Shonen/Seinen Mangas Where the MC isekai-ed, and he knows the plot.

[Robinisback]

Just something like My Death Flags Show No Sign of Ending where the MC knows the plot and please Don't let it be a Shoujo Manga.

 

[Yatsuki]

@Robinisback
This one
https://mangadex.org/title/53724/trash-of-the-count-s-family

 

[Robinisback]

Hey, @Yatsuki can you tell where I can read the missing chapters?

 

[Yatsuki]

@Robinisback You should try other aggregator sites

 

[ryouhira]

@Robinisback Manga4life is my favorite site

 

[Robinisback]

Thanks, @ryouhira

 

[JustStrollingBy]

@Robinisback I use https://leviatanscans.com/comics/929440-trash-of-the-counts-family to see it

 

[JustStrollingBy]

The Villainess's Butler ~I Raised Her to Be Very Cute~
Not really sure about the demographic but MangaDex says its Seinen. Basically MC gets transmigrated into an Otome Game as the villainess' butler and is now trying to lead her to a better path. The basic plot seems more like a Shoujo manga so I'm not sure if this'll interest you.

 

[Robinisback]

@JustStrollingby The Thing is that I have read too much Shoujo Mangas at this point that I expect every manga to have that kind of Artstyle , I just want break from Shoujo for now. Besides , I have already read all the chapter of the Manga you suggested.

 

[orangegoat72]

@Robinisback
Doctor's Rebirth

 

[Falador]

https://mangadex.org/title/54961/trapped-in-a-webnovel-as-a-good-for-nothing/chapters/