A lot of Korean romance in medieval times

Mc transmigrated to a novel as the ML secretary's Lil sister, but she won't let the ML kill his brother just because of love.

Novel:
https://www.novelupdates.com/series/im-worried-that-my-brother-is-too-gentle/

Finished
Mc transmigrated into the only child of the emperor only to be killed later on when her sister appears, now as a child she will have to win her father love just so she can live in the future.

Novel:
https://woopread.com/series/who-made-me-a-princess-novel/

Mc transmigrated to a novel as the villain but she doesn't want to be killed so she befriends the ML.
**Read the novel, but it didn't do much for the manhwa so I'd say to skip it as you won't learn anything knew of the plot or characters.


Novel:https://www.novelupdates.com/series/i-become-the-wife-of-the-male-lead/?pg=1#myTable

Mc got reincarnated as the aunt of the ML in a novel she liked, with almost no time before the story begins she want to treat him right and send him on his way but, she somehow gets thrown to the plot.

Spanish:
https://lectortmo.com/library/manhwa/59319/cambiare-el-genero-de-esta-novela

As an unrecognized child of the family, she dies when the old version of truck-kun runs her over. Now, back in time, she'll change everything so that the trash in her family gets what they deserve and save herself.

* Novel in watpat
Spanish:
https://lectormanga.com/library/manhwa/57722/en-esta-vida-sere-la-soberana

One day MC wrote her thoughts and feelings regarding the royal family thinking nothing would happen... They get published and now she's getting arrested by the prince!

Spanish:
https://lectortmo.com/library/manhwa/48349/soy-la-fan-del-principe

After being married to a soldier so her abusive father could scape the war she is kidnapped by her husband and shown the way of life

Novel:
https://lightnovelheaven.com/series/under-the-oak-tree/

Spanish:
https://lectortmo.com/library/manhwa/52902/debajo-del-roble

After marrying a duke and immediately after left as a widow, now she has to change the future so that her new children will invite her to their wedding.

Spanish:
https://lectortmo.com/library/manhwa/44984/la-madrastra-de-merchen

Novel:
https://www.novelupdates.com/series/a-stepmothers-marchen/

Finished
When she transmigrated into a novel she once read, she became aware of several facts: all the MLs were pieces of garbage; the FL is badass, and that she just can't put up with that world. Now she will show them all what being a ML actually is.

Spanish:
https://lectortmo.com/library/manhwa/49276/cuidado-con-la-mujer-malvada

**Read the novel and I really loved it but after reading the 5 chapter available in Spanish, I don't think I'll like the manhwa since it is changing some things and kind of taking a comedy route that wasn't in the novel but we'll see.
The novel is good if you don't mind the non related incest.

MC transmigrated to a novel as the daughter of a Duke just to realize that her younger brother will kill her.

Novel:
https://www.novelupdates.com/series/the-villa