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Episode ratings for the KBS2 drama Fatal Promise

Date	Episode	TNmS (%)	Nielsen Korea (%)
		Nationwide	Nationwide	Seoul
2020-03-30	01	16.4	12.5 (3rd)	10.5 (3rd)
2020-03-31	02	16.4	12.2 (3rd)	10.2 (3rd)
2020-04-01	03	16.6	12.4 (4th)	10.5 (7th)
2020-04-02	04	16.1	11.7 (3rd)	9.9 (3rd)
2020-04-03	05	16.4	12.3 (3rd)	10.9 (5th)
2020-04-06	06	16.7	12.2 (3rd)	10.4 (3rd)
2020-04-07	07	17.6	13.1 (3rd)	11.3 (3rd)
2020-04-08	08	17.8	13.0 (3rd)	11.4 (5th)
2020-04-09	09	16.0	13.2 (3rd)	11.2 (3rd)
2020-04-10	10	16.2	12.5 (3rd)	10.6 (6th)
2020-04-13	11	16.8	12.3 (3rd)	11.0 (4th)
2020-04-14	12	16.9	13.8 (3rd)	12.7 (3rd)
2020-04-15	13	-	12.2 (2nd)	11.0 (3rd)
2020-04-16	14	17.3	12.9 (3rd)	10.9 (3rd)
2020-04-17	15	17.7	14.4 (3rd)	13.3 (3rd)
2020-04-20	16	16.3	13.3 (3rd)	12.0 (3rd)
2020-04-21	17	17.0	13.8 (3rd)	11.8 (4th)
2020-04-22	18	17.2	13.6 (3rd)	11.9 (3rd)
2020-04-23	19	15.7	13.4 (2nd)	12.1 (2nd)
2020-04-24	20	17.2	13.1 (3rd)	11.7 (3rd)
2020-04-27	21	17.0	13.3 (3rd)	11.9 (4th)
2020-04-28	22	17.8	13.3 (3rd)	12.3 (3rd)
2020-04-29	23	17.0	12.7 (3rd)	11.7 (3rd)
2020-04-30	24	15.5	12.6 (2nd)	11.3 (2nd)
2020-05-01	25	15.8	12.2 (3rd)	10.3 (3rd)
2020-05-04	26	15.1	12.4 (3rd)	11.3 (3rd)
2020-05-05	27	16.6	13.0 (3rd)	12.0 (4th)
2020-05-06	28	16.2	12.8 (3rd)	11.0 (4th)
2020-05-07	29	15.9	13.0 (2nd)	11.5 (3rd)
2020-05-08	30	15.0	11.4 (3rd)	10.1 (3rd)
2020-05-11	31	16.2	13.0 (3rd)	11.8 (3rd)
2020-05-12	32	16.6	12.2 (3rd)	11.0 (3rd)
2020-05-13	33	16.4	12.7 (3rd)	10.8 (3rd)
2020-05-14	34	16.3	12.8 (3rd)	11.5 (3rd)
2020-05-18	35	17.2	13.8 (2nd)	12.5 (2nd)
2020-05-19	36	16.5	13.2 (3rd)	11.6 (3rd)
2020-05-20	37	16.7	12.1 (3rd)	10.2 (5th)
2020-05-21	38	15.6	12.3 (2nd)	10.9 (3rd)
2020-05-22	39	16.1	12.4 (2nd)	11.7 (3rd)
2020-05-25	40	16.5	14.3 (3rd)	13.0 (3rd)
2020-05-26	41	18.0	14.0 (2nd)	13.2 (3rd)
2020-05-27	42	16.0	13.2 (3rd)	11.5 (3rd)
2020-05-28	43	16.2	12.8 (2nd)	11.6 (2nd)
2020-06-01	44	15.5	12.7 (3rd)	11.3 (3rd)
2020-06-02	45	16.7	14.0 (2nd)	12.8 (2nd)
2020-06-03	46	15.7	12.8 (2nd)	11.5 (3rd)
2020-06-04	47	12.2	13.3 (2nd)	12.2 (2nd)
2020-06-08	48	14.7	13.3 (3rd)	12.4 (3rd)
2020-06-09	49	15.2	13.1 (3rd)	11.5 (3rd)
2020-06-10	50	17.4	13.8 (2nd)	12.6 (2nd)
2020-06-11	51	16.2	13.4 (2nd)	12.5 (2nd)
2020-06-12	52	17.3	13.7 (2nd)	12.8 (2nd)
2020-06-15	53	15.8	13.2 (3rd)	12.3 (3rd)
2020-06-17	54	15.8	12.8 (3rd)	11.3 (3rd)
2020-06-18	55	17.2	14.2 (2nd)	13.2 (2nd)
2020-06-19	56	14.9	12.2 (3rd)	11.8 (4th)
2020-06-22	57	16.2	12.9 (3rd)	11.9 (3rd)
2020-06-23	58	16.1	13.6 (3rd)	12.5 (3rd)
2020-06-24	59	18.2	15.2 (2nd)	14.3 (2nd)
2020-06-25	60	18.0	14.9 (1st)	13.7 (1st)
2020-06-26	61	15.3	12.9 (2nd)	12.1 (3rd)
2020-06-29	62	18.8	15.2 (2nd)	13.4 (2nd)
2020-06-30	63	18.3	15.1 (2nd)	14.0 (2nd)
2020-07-01	64	15.8	13.8 (2nd)	12.1 (2nd)
2020-07-02	65	17.1	13.9 (2nd)	11.9 (2nd)
2020-07-03	66	18.0	14.2 (2nd)	11.9 (2nd)
2020-07-06	67	18.1	14.6 (3rd)	13.3 (2nd)
2020-07-07	68	17.6	14.5 (2nd)	13.4 (2nd)
2020-07-08	69	16.8	13.5 (3rd)	11.8 (3rd)
2020-07-09	70	17.7	13.9 (3rd)	12.6 (3rd)
2020-07-10	71	16.8	14.6 (3rd)	12.9 (3rd)
2020-07-13	72	18.7	15.2 (2nd)	14.1 (2nd)
2020-07-14	73	17.7	14.8 (2nd)	12.3 (3rd)
2020-07-15	74	17.6	14.6 (2nd)	12.9 (3rd)
2020-07-16	75	16.7	14.4 (2nd)	13.2 (2nd)
2020-07-17	76	17.7	14.1 (2nd)	12.5 (3rd)
2020-07-20	77	18.4	14.7 (2nd)	13.0 (3rd)
2020-07-21	78	17.9	15.3 (2nd)	13.7 (2nd)
2020-07-22	79	19.6	15.8 (2nd)	13.2 (2nd)
2020-07-23	80	21.2	16.4 (2nd)	15.1 (2nd)
2020-07-24	81	18.8	14.5 (3rd)	12.1 (3rd)
2020-07-27	82	21.1	16.0 (2nd)	13.9 (3rd)
2020-07-28	83	19.7	15.8 (2nd)	13.7 (2nd)
2020-07-29	84	19.3	14.9 (2nd)	13.4 (2nd)
2020-07-30	85	19.0	14.7 (2nd)	12.9 (2nd)
2020-08-03	86	18.8	15.5 (3rd)	14.5 (3rd)
2020-08-04	87	18.2	14.8 (3rd)	13.6 (3rd)
2020-08-05	88	17.7	14.6 (3rd)	13.0 (3rd)
2020-08-06	89	17.5	14.7 (3rd)	12.7 (3rd)
2020-08-07	90	18.8	14.6 (2nd)	12.0 (3rd)
2020-08-10	91	19.8	16.5 (3rd)	14.8 (3rd)
2020-08-11	92	19.2	15.9 (2nd)	13.8 (3rd)
2020-08-12	93	18.3	15.1 (3rd)	13.6 (3rd)
2020-08-13	94	18.9	14.7 (2nd)	13.4 (2nd)
2020-08-14	95	17.7	14.3 (2nd)	12.9 (2nd)
2020-08-17	96	17.2	15.0 (3rd)	13.9 (3rd)
2020-08-18	97	17.6	15.1 (3rd)	13.5 (3rd)
2020-08-19	98	18.1	15.1 (3rd)	13.5 (3rd)
2020-08-20	99	17.8	15.1 (2nd)	14.4 (2nd)
2020-08-24	100	-	15.6 (3rd)	14.9 (3rd)
2020-08-25	101	-	-	-
2020-08-26	102	-	-	-
2020-08-27	103	-	-	-
2020-08-28	104	-	-	-
Average		%	%	%

Source: TNmS Media, Nielsen Korea

Notes

• No episode aired on May 15 due to the broadcast of a 2020 KBO league game of Lotte Giants vs. Hanwha Eagles.
• No episode aired on May 29 due to the broadcast of a 2020 KBO league game of LG Twins vs. KIA Tigers.
• No episode aired on June 5 due to the broadcast of a 2020 KBO league game of KIA Tigers vs. Doosan Bears.
• No episode aired on June 16 due to the broadcast of the 2020 KBS league game of NC Dinos vs. KIA Tigers.
• No episode aired on July 31 due to the broadcast of the 2020 KBS league game of KIA Tigers vs. Lotte Giants.
• No episode aired on August 21 due to the broadcast of the 2020 KBS league game of Lotte Giants vs. Doosan Bears.