I LOVE to re-watch dramas. When I am getting over one I have just finished or I'm in a weird mood, I go to a drama I know will deliver or do a jump through the scenes I like etc. I am going to match the original post and up it again to many more then 5 times.
5. Ji Chang Wook - Healer, K2
6. Legend of the Blue Sea, Oh My Venus
7. Lee Jong Suk - Pinnochio, I Hear Your Voice, While You Were Sleeping
I could keep going as my brain often recalls a particular scene of a particular drama so I go back and re-watch the whole thing. There are only a handful that I haven't watched more than once or skipped through again. That said, as the rule of three states, I shall leave the rest to others.