Looks like a big one for this year and for Lee Min Ho and Jeon Ji Hyeon
Air Date: Nov 16, 2016 to Jan 19, 2017 

Plot: How can a mermaid from the Joseon era survive in modern-day Seoul? Shim Chung is a mermaid who finds herself transplanted to modern times. She is caught by Heo Joon Jae, a charming but cold con artist who is the doppelgänger for Kim Moon, the son of a nobleman from the Joseon Dynasty. But in the present time, Joon Jae works with Jo Nam Doo, a skilled conman who guides Joon Jae to become a genius scammer. But Joon Jae’s friend, Cha Shi Ah, who works as a researcher at KAIST, may be Chung’s only hope for surviving in her strange new world. 

**Inspired by a classic Joseon legend from Korea’s first collection of unofficial historical tales, about a fisherman who captures and releases a mermaid, this drama tells the love story between the son of a noble family in Joseon era and a mermaid. 

This 20 episode comedy fantasy mermaid romance drama series info is found here on mydramalist, http://mydramalist.com/18816-legend-of-the-blue-se...

Links to the first three teasers can be found here 
https://www.youtube.com/watch?v=KDobModufSg
https://www.youtube.com/watch?v=G_jt3EwBMwU
https://www.youtube.com/watch?v=Oe7EZDUEwt4

Scroll down for pictures of the show, Looks Goooooooood... no. Greaaaaaattt.... Are you excited?
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I watched the trailers when they came out, it seems like a nice drama! 
I'm looking forward to this! I just hope it doesn't disappoint. 
Same here!  I'm so excited for this one!  I've been counting down the days.  :P  I love mermaid stories, but there really aren't very many to be found in Dramaland, unfortunately.  I really, really hope this one will be good. :)