Historical manhwa, set in korea in the past, possibly smut or adult, male lead had long red hair, tied up usually, and he was the ruler(? Female lead was transmigrated/isekaid, had brown hair and eyes, I think she had technology with her, possibly had modern clothes in the first chapter, it's not a recent manwha. I believe the male lead was not very mature
Historical manhwa, set in korea in the past, possibly smut or adult, male lead had long red hair, tied up usually, and he was the ruler(? Female lead was transmigrated/isekaid, had brown hair and eyes, I think she had technology with her, possibly had modern clothes in the first chapter, it's not a recent manwha. I believe the male lead was not very mature
Adding that I think the ML wanted to make FL an empress very early in the story
https://www.mangago.me/read-manga/what_kind_of_empress_is_this/ ?
I love you. It is that one, thank you <3