I Thought It Was a Common Isekai Story
. Only official! . . . MC had terrible past relationships with her family (was accidentally killed by her brother when he in anger pushed her and she fell from stairs) and now she had transmigrated into count's family, however family is shitty and abusive, however soon she married into duke's family, and is hoping to spend her time peacefully there . . . . . . .
Leveling Up With Skills
. . . Go to tower/dungeon on your chosen difficulty to get stronger, survive, come back to earth and fight monsters there . . . . . .
Pick Me Up
. . . . There existed game "Pick me up" where you player/master summon your heroes and send them to conquer tower/dungeon. MC was best Korean player and high ranking world player of this game, however suddenly he founds himself inside that game as lowest 1 star character and comes to realisation, that all these heroes are not just smart A.I. job, but actual living breathing human beings . . . . . . . .
The Hunter Wants to Live Quietly
Surviving as a Genius on Borrowed Time
. . . . MC was shunned by his family because he has short lifespan (smth about his head acute point being too wide open, which makes him life for waaaay shorter time then others) and he spent his days honing, learning and creating new martial arts (it comes easy to him cause this wide opening that shortens his live gifts him profound understanding of martial arts). One day his clan is attacked, most of it is killed by one of 13th notorious evil sects, however it's leader takes a liking of MC and let's him live. Then MC goes to desolate castle sect (?) where his maternal mother was from (she died while giving birth to him) and decides to join it and learn there and maybe find a way to fix his short lifespan. . . . . . . . . . . . .
A Modern Man Who Got Transmigrated Into the Murim World