Jumong - big sweeping epic, similar feel to Queen Seondeok - tons of fun, ending is bittersweet but mostly happy
Return of Iljimae - meditative, lovely, bittersweet but not horribly tragic ending
Six Flying Dragons - absolutely amazing, not a happy ending
Sungkyunkwan Scandal - lots of adorable romance/bromance, ending is a bit awkward but generally happy
Painter of the Wind - lovely show with stunning art - the ending is a bit ambiguous, and some folks interpreted it as a downer, but I thought it was awesome and very positive