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Episode ratings for SBS drama Legend of the Blue Sea

Date	Episode	TNmS (%)		Nielsen Korea (%)
		Nationwide	Seoul	Nationwide	Seoul	Peak
2016-11-16	01	15.4 (4th)	18.9 (3rd)	16.4 (4th)	18.0 (2nd)	20.7
2016-11-17	02	16.2 (4th)	20.1 (3rd)	15.1 (4th)	16.4 (4th)	18.8
2016-11-23	03	16.6 (4th)	19.6 (2nd)	15.7 (4th)	17.2 (4th)	20.0
2016-11-24	04	17.9 (4th)	21.3 (3rd)	17.1 (4th)	18.4 (3rd)	21.1
2016-11-30	05	16.4 (4th)	18.4 (2nd)	16.8 (3rd)	18.5 (1st)	21.9
2016-12-01	06	18.1 (2nd)	20.2 (1st)	18.9 (2nd)	22.1 (1st)	25.2
2016-12-07	07	15.8 (4th)	18.1 (2nd)	17.4 (2nd)	19.2 (1st)	21.2
2016-12-08	08	17.4 (3rd)	19.7 (1st)	17.4 (2nd)	19.1 (2nd)	21.3
2016-12-14	09	14.8 (5th)	16.4 (2nd)	16.6 (2nd)	18.8 (2nd)	20.2
2016-12-15	10	16.8 (4th)	19.2 (2nd)	17.5 (2nd)	19.3 (2nd)	21.3
2016-12-21	11	17.7 (3rd)	20.1 (2nd)	16.7 (3rd)	18.1 (2nd)	21.9
2016-12-22	12	16.3 (4th)	18.0 (2nd)	17.3 (3rd)	18.7 (2nd)	20.9
2016-12-28	13	15.8 (4th)	18.4 (2nd)	16.0 (4th)	17.2 (3rd)	20.3
2017-01-04	14	15.1 (4th)	18.1 (3rd)	17.8 (3rd)	18.7 (2nd)	20.8
2017-01-05	15	15.9 (3rd)	19.4 (2nd)	18.3 (3rd)	20.1 (2nd)	22.1
2017-01-11	16	15.1 (4th)	19.0 (2nd)	18.9 (3rd)	20.7 (2nd)	22.3
2017-01-12	17	18.9 (3rd)	22.2 (2nd)	20.8 (2nd)	23.0 (2nd)	25.1
2017-01-18	18	16.5 (3rd)	18.4 (2nd)	18.3 (3rd)	19.9 (2nd)	21.3
2017-01-19	19	18.7 (3rd)	20.4 (2nd)	21.0 (2nd)	22.2 (2nd)	23.9
2017-01-25	20	16.2 (4th)	18.4 (2nd)	17.9 (3rd)	18.8 (2nd)	20.5
Average		16.5%	19.2%	17.6%	19.2%	-
2016-12-29	Special	11.5 (8th)	13.3 (4th)	11.2 (7th)	12.3 (4th)	15.3

Source: TNmS Media, Nielsen Korea

Notes

• Episode 14 did not air on December 29. Instead, a special feature that stitches together popular scenes from the first 13 episodes was shown.