Sweet Guy
ML gets some kind of special ability.
Maou no Hajimekata
ML builds a harem of demons
Curse of Loulan: The Tyrant Bestows Favor on Me Webtoon
ML is cursed and only FL can cure him. She goes back in time to help him. It's super cute and they end up married with kids at the end.
Maid in a Dream
FL is a student but when she's sleeping she's the emporers maid. Potentially GL
The Lord of Sun
FL is sold to serve the emporer after her mother is killed. The village hates her because she looks different, and she has different healing abilities
I was Told to Relinquish My Fiance to My Little Sister, and the Greatest Dragon Took a Liking to Me and Unbelievably Took Over the Kingdom
FLs engagement to crown prince is cancelled and her sister takes over. She goes to sacrifice herself to be killed by the local Dragon, but he takes her as his wife instead. He then takes over a couple of countries so she's queen as originally planned. I'm enjoying this so far. Ongoing ch19
The Favored Concubine
FL has lost her memories and falls into MLs land. A monster is awakened and other supernatural stuff happens after she arrives.
Ningen Desuga Maou Totsugu Koto Ni Narimashita
FL is summoned to serve the demon Lord.
The Exorcist and the Collared Demon
FL is a demon trapped in a girls body, who is helped by a priest.
Oni-san Dochira? - Koushokubaraishi to Toraware no Oni