Once Again (seri televisi Korea Selatan)
Peringkat

Pada tabel berikut, angka berwarna biru menunjukkan peringkat terendah dan angka berwarna merah menunjukkan peringkat tertinggi.
N/A untuk peringkat yang tidak atau belum diketahui.
| Ep> .Ep..Ep. | Tanggal rilis perdana> Tanggal rilis perdana.Tanggal rilis perdana | Peringkat rata-rata> AGB Nielsen.Nasional | Peringkat rata-rata> AGB Nielsen.Seoul | Peringkat rata-rata> TNmS.Nasional |
| --- | --- | --- | --- | --- |
| 1 | 28 Maret 2020 | 19,4% | 17,7% | 20,2% |
| 2 | 28 Maret 2020 | 23,1% | 21,7% | 23,3% |
| 3 | 29 Maret 2020 | 22,9% | 23,2% | 22,3% |
| 4 | 29 Maret 2020 | 26,3% | 25,3% | 26,4% |
| 5 | 4 April 2020 | 20,5% | 18,8% | 22,0% |
| 6 | 4 April 2020 | 24,5% | 22,4% | 25,4% |
| 7 | 5 April 2020 | 24,2% | 22,8% | 25,0% |
| 8 | 5 April 2020 | 28,1% | 27,4% | 29,1% |
| 9 | 11 April 2020 | 21,3% | 20,1% | 21,0% |
| 10 | 11 April 2020 | 26,0% | 25,5% | 25,3% |
| 11 | 12 April 2020 | 26,7% | 26,1% | 25,8% |
| 12 | 12 April 2020 | 29,6% | 29,3% | 29,3% |
| 13 | 18 April 2020 | 21,3% | 20,8% | 19,8% |
| 14 | 18 April 2020 | 26,6% | 26,4% | 23,1% |
| 15 | 19 April 2020 | 26,3% | 25,7% | 24,6% |
| 16 | 19 April 2020 | 29,9% | 30,3% | 27,0% |
| 17 | 25 April 2020 | 25,0% | 21,4% | 20,4% |
| 18 | 25 April 2020 | 25,5% | 21,6% | 25,2% |
| 19 | 26 April 2020 | 28,4% | 23,9% | 23,6% |
| 20 | 26 April 2020 | 28,8% | 28,3% | 27,9% |
| 21 | 2 Mei 2020 | 21,4% | 21,2% | 20,6% |
| 22 | 2 Mei 2020 | 26,1% | 26,1% | 25,3% |
| 23 | 3 Mei 2020 | 24,5% | 23,7% | 23,7% |
| 24 | 3 Mei 2020 | 28,2% | 27,6% | 28,2% |
| 25 | 9 Mei 2020 | 26,6% | 26,7% | — |
| 26 | 9 Mei 2020 | 22,1% | 21,8% | — |
| 27 | 10 Mei 2020 | 25,1% | 25,0% | 24,9% |
| 28 | 10 Mei 2020 | 30,2% | 30,5% | 29,4% |
| 29 | 16 Mei 2020 | 22,0% | 21,9% | 19,7% |
| 30 | 16 Mei 2020 | 27,2% | 26,8% | 24,3% |
| 31 | 17 Mei 2020 | 26,6% | 27,1% | 24,3% |
| 32 | 17 Mei 2020 | 29,9% | 30,4% | 29,3% |
| 33 | 23 Mei 2020 | 21,8% | 21,4% | 21,1% |
| 34 | 23 Mei 2020 | 26,3% | 25,6% | 25,8% |
| 35 | 24 Mei 2020 | 27,4% | 27,2% | 26,1% |
| 36 | 24 Mei 2020 | 31,1% | 30,5% | 29,5% |
| 37 | 30 Mei 2020 | 21,2% | 20,4% | 20,5% |
| 38 | 30 Mei 2020 | 27,0% | 26,1% | 26,0% |
| 39 | 31 Mei 2020 | 26,0% | 25,6% | 25,6% |
| 40 | 31 Mei 2020 | 30,9% | 30,6% | 29,5% |
| 41 | 6 Juni 2020 | 23,7% | 24,1% | 21,8% |
| 42 | 6 Juni 2020 | 28,5% | 28,8% | 26,8% |
| 43 | 7 Juni 2020 | 26,5% | 26,0% | 25,7% |
| 44 | 7 Juni 2020 | 30,1% | 29,5% | 30,0% |
| 45 | 13 Juni 2020 | 23,9% | 23,1% | — |
| 46 | 13 Juni 2020 | 28,7% | 28,0% | — |
| 47 | 14 Juni 2020 | 27,8% | 27,5% | 25,6% |
| 48 | 14 Juni 2020 | 31,6% | 31,1% | 30,3% |
| 49 | 20 Juni 2020 | 23,1% | 23,4% | 21,0% |
| 50 | 20 Juni 2020 | 28,8% | 28,0% | 26,5% |
| 51 | 21 Juni 2020 | 28,6% | 28,5% | 25,7% |
| 52 | 21 Juni 2020 | 31,5% | 31,9% | 29,9% |
| 53 | 27 Juni 2020 | 23,6% | 23,3% | 20,9% |
| 54 | 27 Juni 2020 | 28,0% | 27,5% | 26,9% |
| 55 | 28 Juni 2020 | 28,5% | 28,3% | 25,5% |
| 56 | 28 Juni 2020 | 32,2% | 31,5% | 30,1% |
| 57 | 4 Juli 2020 | 23,2% | 22,6% | 21,4% |
| 58 | 4 Juli 2020 | 28,6% | 28,5% | 25,6% |
| 59 | 5 Juli 2020 | 28,9% | 28,5% | 25,8% |
| 60 | 5 Juli 2020 | 33,0% | 33,0% | 29,7% |
| 61 | 11 Juli 2020 | 24,6% | 24,2% | 22,7% |
| 62 | 11 Juli 2020 | 29,6% | 29,5% | 27,7% |
| 63 | 12 Juli 2020 | 30,3% | 29,7% | 27,8% |
| 64 | 12 Juli 2020 | 33,3% | 32,5% | 30,9% |
| 65 | 18 Juli 2020 | 23,9% | 23,5% | 23,8% |
| 66 | 18 Juli 2020 | 29,4% | 28,7% | 28,4% |
| 67 | 19 Juli 2020 | 30,4% | 30,3% | 28,9% |
| 68 | 19 Juli 2020 | 33,7% | 33,4% | 33,0% |
| 69 | 25 Juli 2020 | 24,2% | 23,1% | 21,9% |
| 70 | 25 Juli 2020 | 28,7% | 27,6% | 26,3% |
| 71 | 26 Juli 2020 | 29,6% | 28,9% | 28,3% |
| 72 | 26 Juli 2020 | 33,0% | 32,7% | 32,0% |
| 73 | 1 Agustus 2020 | 25,7% | 25,0% | 24,6% |
| 74 | 1 Agustus 2020 | 30,1% | 29,3% | 29,5% |
| 75 | 2 Agustus 2020 | 32,1% | 32,3% | 30,0% |
| 76 | 2 Agustus 2020 | 35,6% | 36,0% | 34,2% |
| 77 | 8 Agustus 2020 | 29,4% | 28,7% | 26,9% |
| 78 | 8 Agustus 2020 | 33,2% | 32,4% | 30,6% |
| 79 | 9 Agustus 2020 | 33,6% | 33,2% | 30,0% |
| 80 | 9 Agustus 2020 | 36,5% | 36,1% | 33,6% |
| 81 | 15 Agustus 2020 | 26,9% | 27,0% | 25,0% |
| 82 | 15 Agustus 2020 | 31,4% | 31,8% | 30,0% |
| 83 | 16 Agustus 2020 | 29,6% | 28,6% | 29,2% |
| 84 | 16 Agustus 2020 | 32,9% | 31,4% | 32,5% |
| 85 | 22 Agustus 2020 | 29,2% | 29,5% | 26,7% |
| 86 | 22 Agustus 2020 | 33,2% | 33,7% | 30,8% |
| 87 | 23 Agustus 2020 | 32,8% | 32,5% | 31,1% |
| 88 | 23 Agustus 2020 | 35,5% | 35,1% | 35,2% |
| 89 | 29 Agustus 2020 | 30,2% | 30,2% | 29,1% |
| 90 | 29 Agustus 2020 | 35,5% | 35,5% | 33,7% |
| 91 | 30 Agustus 2020 | 34,5% | 34,0% | 32,5% |
| 92 | 30 Agustus 2020 | 36,5% | 35,7% | 35,5% |
| 93 | 5 September 2020 | 27,4% | 26,0% | 27,4% |
| 94 | 5 September 2020 | 32,6% | 31,2% | 31,9% |
| 95 | 6 September 2020 | 34,8% | 34,7% | 32,1% |
| 96 | 6 September 2020 | 37,0% | 37,0% | 35,4% |
| 97 | 12 September 2020 | 29,6% | 28,9% | — |
| 98 | 12 September 2020 | 33,5% | 33,4% | — |
| 99 | 13 September 2020 | 33,6% | 33,0% | 32,8% |
| 100 | 13 September 2020 | 34,8% | 33,9% | 34,9% |
| Rata-rata | Rata-rata | 28,4% | 27,9% | — |