I only have "Death Bell" but haven't seen it yet
don't know if "god of study" and "possessed" are worth checking
only know these 3 xD
LoL and that's the only 3 I have. "Death Bell" was ok IMO, it was Saw-ish gory but got confused whether it was dealing with supernatural forces or a crazed killer. But Eunjung had a significant role in the movie as the story revolved around her even though she was not the main character. I wanted to mention that movie because Jiyeon is going to star in sequel which will release this summer.
As for the dramas, any k-drama is worth watching.
"Hon" (Soul or Possessed) is interesting because it's a horror/suspense drama which I have hardly seen in dramas. I'm surprised how violent and gory some scenes were. Jiyeon's one of the main characters and Boram cameos in few episodes. It's kinda sad. I haven't finished watching it yet.
And "God of Study" is the remake of "Dragon Zakura". I watched both dramas at the same time and while I think the jpn version probably follows the manga, the drama seems more rushed than the kor version but that's because j-dramas are only 11 episodes while k-dramas are 16, so there's more room to add background stories of each character. Jiyeon is so cute in this drama, finally acting her age for once lol then T-ara cameos in a few episodes as bullies. Haven't finished watching this one either.
That's all I gotta say about that.
I have another movie with Eunjung in it which turns out to be one of my favorite movies I watch all the time but her role was so small in it I hardly noticed her.
Anyway, tonight I heard they will perform both of their new songs on Inkigayo tonight! Can't wait!