Hi!!
I was like you...I was thinking that historical drama were weird...but then I saw Arang and the magistrate only because of the leads actors and made me fall in love with korean historical drama.(I even searched the history of Korea in an encyclopaidia )

When you say historical drama you mean the ones who are about real events or the ones who are based on real events and are more fictional?

For real historical I would suggest:
Jumong (amazing)
Hwajeong
The Flower in prison
King's daughter Soo Baek Hyang (It's a 120+ episode drama but for some reason it got me hooked )

For fictional historical I would highly recommend: (MUST WATCH)
Arang and the Magistrate (really funny and I've seen it 2 times most of it)
Moon that embraces the sun
Princess' Man (I've seen it 2 times)
Joseon Gunman (I've seen it 2 times)
Faith
Maids (It's kinda harsh but it shows reality...)

Hope I helped...