Circle : fantastic sci-fi with some lovely character arcs and a tight plot with endless twists that actually make sense.
Jealousy Incarnate : One of the best ensembles in k-dramas, also one of the only love triangles that was handled really well and didn't make me want to pull my hair out, beautiful chemistry between the leads and touches on some really interesting subjects, it was pretty refreshing.
Also Bridal Mask and TWTW (which a lot of people didn't love but i adored).