Not a webtoon, but a manga: The painter behind the painting
It's got an asshole seme, that grovels and redeems himself 9/10
Some have supernatural/fantasy elements.
Bongchon Bride (there's a smut and non-smut version)
Heaven Official's Blessing
To Take An Enemy's Heart
Demon Wants to Hug
Plum Blossom Shade
An Abyss
King's Maker
A Painter Behind the Curtain
Beauty And The West Chamber
Paljae
Gorani Jeon
Our Reputation Is Not Very Well
Mo Dao Zu Shi
Turning
The rogue prince is secretly an omega
Both omegaverse tho
Please recommend me historical bl webtoon