There’s the action one “Trash of the count family” no romance but I highly recommend
A really popular one is "trash of the count's family"
And there are also:
"The Beginning After The End"
"The greatest estate developer" (personal fav)
"The reincarnated assassin is a sword master"
"Academy undercover professor"
╮(￣▽￣)╭
When the Third Wheel Strikes Back - no romance but the MC gets shipped with the FL and the ML.
Guys transmigrating into villains is pretty popular in danmei but not so much in straight stories. I have seen some straight mangas around there with dudes reincarnating into stories but they usually reincarnate into mobs.
JUST WONDERING, WE ALL KNOW THOSE POPULAR TRANSMIGRATION MANHWA, WHERE ITS ALWAYS GIRL DAT TRANSMIGRATE IN BODY OF A VILLAINESS, EXTRA, SAINTESS OR EVEN HEROINE, BUT I JUST WONDERING.. . IS THERE EVEN A GUY DIS TIME? DA ONE WHO GOT TRANSMIGRATE, READING A NOVEL AND KNOWS DA STORY AND ENDED IN A VILLAIN BODY OR SAINT OR WHATEVER... .
I ACTUALLY READ ONE BUT ITS BL, I'M TALKING ABOUT STRAIGHT ROMANCE LIKE THOSE POPULAR MANHWA.