<P> Due to the star power of Jun and Lee, the series maintained the first place ranking for its timeslot and surpassed 20% viewership ratings . The series also fared well overseas, having been exported to all major regions around the world, including Southeast Asia, the Americas and Europe . Despite the show's success, it was criticized for lack of originality, as many viewers felt that the' parallel timeline' and' romance between a human and supernatural being' were recycled elements of writer Park's previous series My Love From the Star (2013 - 2014). Additionally, it was slammed for bad editing, loose plot and lack of chemistry . However, Jun's performance as a mermaid was met with overall high praise; with The Straits Times saying that she is "brilliant as the otherworldly goofball who is blissfully unaware of the mission to save her self - worth" and Yonhap News Agency highlighting her "trademark lanky, slender yet at times powerful and dramatic performance". </P> <P> In the table below, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings . </P> <Table> <Tr> <Th> Episode #</Th> <Th> Date </Th> <Th_colspan="4"> Average audience share </Th> </Tr> <Tr> <Th_colspan="2"> TNmS Ratings </Th> <Th_colspan="2"> AGB Nielsen </Th> </Tr> <Tr> <Th> Nationwide </Th> <Th> Seoul National Capital Area </Th> <Th> Nationwide </Th> <Th> Seoul National Capital Area </Th> </Tr> <Tr> <Th> </Th> <Td> November 16, 2016 </Td> <Td> 15.4% (4th) </Td> <Td> 18.9% (3rd) </Td> <Td> 16.4% (4th) </Td> <Td> 18.0% (2nd) </Td> </Tr> <Tr> <Th> </Th> <Td> November 17, 2016 </Td> <Td> 16.2% (4th) </Td> <Td> 20.1% (3rd) </Td> <Td> 15.1% (4th) </Td> <Td> 16.4% (4th) </Td> </Tr> <Tr> <Th> </Th> <Td> November 23, 2016 </Td> <Td> 18.6% (4th) </Td> <Td> 19.6% (2nd) </Td> <Td> 15.7% (4th) </Td> <Td> 17.2% (4th) </Td> </Tr> <Tr> <Th> </Th> <Td> November 24, 2016 </Td> <Td> 17.9% (4th) </Td> <Td> 21.3% (3rd) </Td> <Td> 17.1% (4th) </Td> <Td> 18.4% (3rd) </Td> </Tr> <Tr> <Th> 5 </Th> <Td> November 30, 2016 </Td> <Td> 16.4% (4th) </Td> <Td> 20.4% (2nd) </Td> <Td> 16.8% (3rd) </Td> <Td> 20.5% (1st) </Td> </Tr> <Tr> <Th> 6 </Th> <Td> December 1, 2016 </Td> <Td> 18.1% (2nd) </Td> <Td> 20.2% (1st) </Td> <Td> 18.9% (2nd) </Td> <Td> 22.1% (1st) </Td> </Tr> <Tr> <Th> 7 </Th> <Td> December 7, 2016 </Td> <Td> 15.8% (4th) </Td> <Td> 18.1% (2nd) </Td> <Td> 17.4% (2nd) </Td> <Td> 19.2% (1st) </Td> </Tr> <Tr> <Th> 8 </Th> <Td> December 8, 2016 </Td> <Td> 17.4% (3rd) </Td> <Td> 19.7% (1st) </Td> <Td> 17.4% (2nd) </Td> <Td> 19.1% (2nd) </Td> </Tr> <Tr> <Th> 9 </Th> <Td> December 14, 2016 </Td> <Td> 14.8% (5th) </Td> <Td> 16.4% (2nd) </Td> <Td> 16.6% (2nd) </Td> <Td> 18.8% (2nd) </Td> </Tr> <Tr> <Th> 10 </Th> <Td> December 15, 2016 </Td> <Td> 16.8% (4th) </Td> <Td> 19.2% (2nd) </Td> <Td> 17.5% (2nd) </Td> <Td> 19.3% (2nd) </Td> </Tr> <Tr> <Th> 11 </Th> <Td> December 21, 2016 </Td> <Td> 17.7% (3rd) </Td> <Td> 20.1% (2nd) </Td> <Td> 16.7% (3rd) </Td> <Td> 18.1% (2nd) </Td> </Tr> <Tr> <Th> 12 </Th> <Td> December 22, 2016 </Td> <Td> 16.3% (4th) </Td> <Td> 18.0% (2nd) </Td> <Td> 17.3% (3rd) </Td> <Td> 18.7% (2nd) </Td> </Tr> <Tr> <Th> 13 </Th> <Td> December 28, 2016 </Td> <Td> 15.8% (4th) </Td> <Td> 18.4% (2nd) </Td> <Td> 16.0% (4th) </Td> <Td> 17.2% (3rd) </Td> </Tr> <Tr> <Th> 14 </Th> <Td> January 4, 2017 </Td> <Td> 15.1% (4th) </Td> <Td> 18.1% (3rd) </Td> <Td> 17.8% (3rd) </Td> <Td> 18.7% (2nd) </Td> </Tr> <Tr> <Th> 15 </Th> <Td> January 5, 2017 </Td> <Td> 15.9% (3rd) </Td> <Td> 19.4% (2nd) </Td> <Td> 18.3% (3rd) </Td> <Td> 20.1% (2nd) </Td> </Tr> <Tr> <Th> 16 </Th> <Td> January 11, 2017 </Td> <Td> 15.1 (4th) </Td> <Td> 19.0% (2nd) </Td> <Td> 18.9% (3rd) </Td> <Td> 20.7% (2nd) </Td> </Tr> <Tr> <Th> 17 </Th> <Td> January 12, 2017 </Td> <Td> 18.9% (3rd) </Td> <Td> 22.2% (2nd) </Td> <Td> 20.8% (2nd) </Td> <Td> 23.0% (2nd) </Td> </Tr> <Tr> <Th> 18 </Th> <Td> January 18, 2017 </Td> <Td> 16.5% (3rd) </Td> <Td> 18.4% (2nd) </Td> <Td> 18.3% (3rd) </Td> <Td> 19.9% (2nd) </Td> </Tr> <Tr> <Th> 19 </Th> <Td> January 19, 2017 </Td> <Td> 18.7% (3rd) </Td> <Td> 20.4% (2nd) </Td> <Td> 21.0% (2nd) </Td> <Td> 22.2% (2nd) </Td> </Tr> <Tr> <Th> 20 </Th> <Td> January 25, 2017 </Td> <Td> 16.2% (4th) </Td> <Td> 18.4% (2nd) </Td> <Td> 17.9% (3rd) </Td> <Td> 18.8% (2nd) </Td> </Tr> <Tr> <Th_colspan="2"> Average </Th> <Th> 16.7% </Th> <Th> 19.3% </Th> <Th> 17.6% </Th> <Th> 19.3% </Th> </Tr> <Tr> <Th> Special </Th> <Td> December 29, 2016 </Td> <Td> 14.5% (8th) </Td> <Td> 13.3% (4th) </Td> <Td> 11.2% (7th) </Td> <Td> 12.3% (4th) </Td> </Tr> </Table> <Tr> <Th> Episode #</Th> <Th> Date </Th> <Th_colspan="4"> Average audience share </Th> </Tr>

Legend of the blue sea ratings in korea
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