most straight stories with smut are written for men and it doesn't sell as well so its less common. also this site is pretty saturated with yaois so imo its harder to find good straight manhwa....
try https://www.mangago.me/read-manga/merry_psycho/
if this was a bl i swear everyone would eat it up
https://www.mangago.me/read-manga/flowers_are_bait/ same author good too, if you read these lmk i have more recommendations
It's that it's easier finding yaoi with interesting, fluffy and cute stories even if they have smut, straight stories seem to be dumber and usually unattractive if they have smut. Recently I came across The Mortifying Ordeal of Being Seen, that's pretty funny and really cute, but i feel like exist so many more yaois like that than straight manhwas, but maybe it's my impression, idk ╥﹏╥
https://www.mangago.me/read-manga/i_just_want_to_mooch_off_your_luck/
- Fluffy and wholesome, with a small dash of revenge.
https://www.mangago.me/read-manga/i_tamed_a_tyrant_and_ran_away/
- Not rlly ur typical turning back time, has some dark elements. Very much focused on revenge and romance.
https://www.mangago.me/read-manga/jishou_akuyaku_reijou_na_konyakusha_no_kansatsu_kiroku/
- LOVE!! Just a silly fl, and a smart ml. Honestly, one of the on mangas rlly enjoy.
That's all I can remember rn, I prolly have other romance stories that I rlly like lol

Guys I feel all the best manhwas/ mangas with smut are yaoi and even without it, yaois have usually more pathos. Apart from reincarnated villainess stories, that after a while feel all the same, I only know like maybe five straight good enough to be suggested, I’m ignorant or is it actually a thing? It could be also this site preferences idk