Love Scar (2002)

Both of these dramas are including the same male lead who is showing the same affection and performance.
It is based on the opposite concept for the male lead of being the younger in the old drama and the old in the newest one.
But though it is been 21 years difference between the both, where they embody the same characters of male lead in my opinion with same romantic genre story.
What is the common I think is that the relationship between the leads is not lasting for long time at the end of story and painstinkly resisting to not be separated.

In both, ex boyfriend returns in FL's life when she's in a relationship and they kind of end up cheating.