After following the Second-Male-Lead-Syndrome - we cannot forget about their female counterparts. We could actually summarize it as the Second-Lead-Syndrome but both have different effects.
Let's be honest, in most dramas the second female leads belong to a not-so-positive category. It's not only that they're trying to manipulate everything and anyone for their personal benefits - most of them are pretty annoying as well and sometimes I just reach the point when I want to beat them up because they are seriously pissing me off. But I admit that they usually are really beautiful women - that's why they're not used to being rejected.
Sure there are some good second female leads, sometimes this manipulative type of character is represented by the mother of the male lead, or maybe someone else who's related to the male lead or female lead in any way.
Who were the most annoying Second-Female-Lead-Syndrome characters then?
The first one that appears in my list is Ok Joo-hyun in The Musical". Yes, at some point her character was pitiful but still one of the most annoying female characters I've ever seen in a Korean drama.
Now we have Kim Yoo-ri in The Master's Sun. In the end she's not that bad though she is annoying throughout the story, yes, but she's not one of the typical characters falling into the category of this syndrome.
However, NOW we have the personification of this syndrome! I think I've never, never, never hated a female character as much as I did hate Jung Yoo-mi in Rooftop Prince. There wasn't even one time when I was freaking out because of a second female lead this much. But what should I say.. People always get what they deserve. So does Hong Se-na. Yes, karma is a bitch.
Another female character that seriously made me freak out.. I don't even know what to say about such a malicious person. Park Soo-jin was seriously getting on my nerves in Flower Boy Next Door. She wasn't trying to get involved with the male lead, that's the only thing she did right, but her character was still one of the most annoying ones I remember.
The next one is Yoo In-na in You Who Came From The Stars. I somehow couldn't dislike her that much though because in fact I do understand her frustration after years of hard work. However, back-stabbing someone who thought of you as their best friend for years definitely isn't the right thing to do.
Of course there are more female characters that fit into this category. But compared to the male leads these manipulative characters are sometimes taken by others as well. We still have to mention Choi Ji-woo in Winter Sonata and Han Chae-ah in All About My Romance.
Sure I know that those actresses might be completely different in real life but somehow they tend to get on my nerves just when I see them in a drama again. However, when they're characters are okay in the next drama, I'm usually able to forgive them.