(Re-post from the original version of this drama's page)
Main leads have met before, male lead does something nice/significant but only the female lead remembers/knows.
So I don't give away any spoilers I'll be as vague as possible:
The feuding male characters are similar in both dramas.
Male lead has a hot temper, is controlling and he has a jealousy issue.
There are probably more but I'll leave them alone =)