Yes, it's true that the plot is quite common in Korean series. Personally, I've seen both romantic comedies of workplace romances between co-workers that are quite funny, and kdramas where one of the partners is a billionaire heir and they face the challenges of being from different social classes. Of all of them I feel that "King the Land" has been my favorite, it really is charming, funny and very light-hearted.
I hope you get a chance to watch it and enjoy it 🤗 Thanks for your comment 💕