Well, I'd recommend a Tw-drama, if the person is a newbie in dramaland I'd recommend Devil Beside You, if that's not the case I'd probably recommend In Time With You. The reason for me to recommend this dramas is that DBY is good for newbies, is easy to follow and understand for those who isn't that familiar with dramaland, and I would recomment ITWY for those who are already in dramaland time enough because is a awesome history, it is indeed a great drama that leads who's watching to either get mad or happy for the characters or even scream at the main lead for being... you know...the main lead and do the kind of stupid things main lead does, however is not a regular history being told and even if the end is predictable or not, you always wonder if you're right, just because the viewer might not be used to what happens there.
Do you have any goal when it comes to dramas, like watch 100 or 200 dramas or asian movies?