Shojoshit:
Is there a drama where the villain takes interest in the female lead?
A good example is Giant where the villain falls in love with the hero's little sister. They were so adorable together.
That dramas was the start of me liking Hwang JungEum and Joo sangwook. They were just sooo awesome together. They are one of the secondary couples i truly love, and despite the guy being suc bad, i so rooted for them. And their kid together.
So the male lead is a villain/bad guy. So like gangster, manipulator, mastermind? Try:
Heartless City
The Devil
Queen of the Game
Slave Hunters
alove to kill
38 squad unit
snow queen,
falling for innocenc
hateful but once again
Also drama with kinda the same thread as Giant, Villain/bad guys secondary leads though much more darker and weirder pair to root for than Giant, but still interesting pairing, try checking out: East of Eden (the ome park HaeJin played, he was bad at start but he konda gets redeemed at the end) and story of a Man (Kim Kangwoo and his psychotic tendency with his obsession with his sister was ekky interesting)