Introvert's comment on Reply: Rudia

@Rudia Of course, I have some recommendation, hope this helps 😀
About the manhwa's focussing on romantic relationship and all:
1. The obsessive second male lead has gone wild (completed)

2. She’s a Villainess, but Her Husband Is Handsome (completed)

3. I Want To Become The Emperor, So I Need A Divorce (completed)

4. What it means to be you (completed but note this one was my first toxic story I read)

5. I took care of him, but he came back obsessed with me (completed)

6. The Princess Doesn’t Want to Be Spoiled (completed but not much romance and they don't even kiss)

7. How to prey on the master (Completed)

8. Lies become you (completed)

9. The Duke of Ashleyan’s Contractual Marriage (completed)

10. Seduce the villain's father (completed but didn't like much except the last arc)

11. Doctor Elise: The Royal Lady With The Lamp (completed)

12. Disobey the Duke if You Dare (completed but note it's very steamy but is not sm**)

13. The tyrant's only perfumer (completed)

14. Of all things, I became a crow (completed and is a very unique story)

15. The villain's aesthetics (completed)

16. The Duke and Duchess divorce circumstances

17. How to reject my obsessive ex husband

18. Why are you obsessed with your fake wife

19. I became the wife of the male lead

20. Honey, why can't we get a divorce

21. I became the Duke's male servant

22. To my husband's mistress

23. I became a poison detector of darkness

I like to post spoilers for the stories I find interesting because I don't have much time to read novel due to busy schedule you will find me in most romantic historical manhwa comment sections