as @RueXie said 'you have a lot of good dramas in your plan to watch list' and secret is a good drama but here's my suggestion, watch
Chief Kim- very very light comedy. no tragedies, no revenge or anything like that. or even romance for that matter. just office-drama-comedy.
or
My Wife’s Having an Affair this Week- full of drama. and as the title suggests it is about the most complex issue that one might face in their daily life. just as the issue is sensitive, the drama handles every aspect of it slowly and carefully. it is very different than all the other romance dramas. the issue is raised in On The Way To The Airport, another very good drama and close to my heart, but that one has different set of circumstances(it is very romantic in the first half where the adultery happens and gets very serious into the later half to solve the problems), and so, handles things differently. My Wife’s Having an Affair this Week is very close to the reality.