Delightful Girl, Choon Hyang (2005)

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.

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