Recommend an actor or actress who the person below you should check out.

I already watched Lee Joon Hyuk in a few dramas, and Shin Hyun Bin in Mistress..

Ryu Soo Young - he was great in Love in Sadness as the obsessive/stalker villain! 

I've seen her in about 5-6 dramas which were all of her in a highschool uniform. I like her.

Jin Dong

Ma Tian Yu 

Hirose Suzu

Inukai Atsuhiro