@Girly girl not to rain on your parade but i don't really think an exact art style replica exists. there are plenty of manhwa with really good art, though: A Stepmother's Märchen, Predatory Marriage, Miss Pendleton, The Male Leads Are Trapped in My House, The Count's Secret Maid, The Fangs That Pierce the Heart, The Heiress's Double Life, Revolutionary Princess Eve, The Perks of Being a Villainess, Secret Lady, Roxana, Just the Male Lead's Friend, The Perks of Being an S-Class Heroine, Turning the Mad Dog into a Genteel Lord, The Baengri Clan's Unwanted Granddaughter, etc.
Psst. You should check these out (they're fuc**** awesome): https://mangabuddy.com/manga-list/210385