Sassy Girl, Chun Hyang

Ayaka, who works at the bridal department at a hotel, has a beauty that everyone recognizes, yet her personality is the worst. Everyone calls her a "wicked woman" after the way she wraps numerous men around her finger. The one who sets his eyes on her is the hotel's new executive Togo, who is the son of a very powerful person of the town. What are the orders that this King-like man requests of her!?

Both plots have the same framework: the lead male has a former love but because of some circumstances he has to be together with the lead female, then appears another guy.
Moreover, both dramas are written by Hong Sisters.

The way they struggle for their love is kinda similar to delightful girl, choon hyang. The emotion and feeling feel the same.

2000s acting and aesthetic, similar class dynamics (poorer fl, rich ml), soapy themes of sabotage and miscommunication, plot gets crazy lol

Both are older dramas that are worth watching if you enjoy romance. The couples have magnetic appeal that carries the shows.