A country's Netflix chart has ten places on it. A company with two shows out at once is using two of them. Whether that is a problem is a scheduling question with money attached, and it is answerable from the weekly lists.
When two series from the same Korean company are on a country's chart in the same week, do they sit lower than when either is there alone?
How this is counted. One pair = one series in one country at one age in weeks, with its average rank on the weeks it was alone set against its average rank on the weeks a series from the same company was also on that chart. Rank 1 is the top of the chart, so a higher number is worse.
| A Korean series on a country's chart | Average rank |
|---|---|
| On the weeks it was there alone | 5.21 |
| On the weeks a series from the same company was also there | 5.71 |
| Difference | 0.5 |
0.5 of one place, on a chart with ten of them. It is in the direction a scheduler would fear — a title sits lower when its stablemate is beside it — and it is small. A company weighing whether to hold a title back for a month is weighing about half a rank.
A title's rank falls as its run goes on, and a company's second title usually arrives later. Comparing without holding age fixed would credit the decline to the sibling instead of to time. Every comparison here is between weeks at the same "weeks in top 10" value.
| Age of the title | Pairs | Alone | With a sibling | Difference |
|---|---|---|---|---|
| Weeks 1–2 | 272 | 5.1 | 5.57 | 0.47 |
| Weeks 3–4 | 190 | 5.04 | 5.17 | 0.13 |
| Weeks 5–8 | 260 | 5.31 | 6.07 | 0.76 |
| Week 9 and later | 81 | 5.69 | 6.29 | 0.6 |
All four bands point the same way, and the last column never reaches a whole place. The comparison never leaves a single series in a single country, so the title's own strength, its company and that country's appetite for Korean shows are all fixed and cannot produce the gap.
| Weeks of charts | 265 |
| Chart rows read | 493,600 |
| Korean series rows with a company attached | 25,598 |
| Of those, rows with a sibling on the same chart | 5,431 |
| Weeks discarded — no week of the same age to compare against | 22,529 |
| Pairs that survived | 803 |
Far more weeks were discarded than kept. A week only counts if the same series, in the same country, at a comparable age, also spent a week without a sibling. Most runs never overlap a stablemate at all, and those contribute nothing.
The first version of this measurement was wrong, and it is worth saying how. We began by matching weeks at exactly the same age — week 4 against week 4. That left 205 pairs, because a title never reaches the same week number twice in one country: the only matches were runs where Netflix's week counter had reset. The sample was not small, it was strange. Matching inside age bands instead gives 803 pairs across 648 runs, at the cost of allowing up to a week of slack inside a band. That cost is stated here rather than hidden.
Across 803 matched pairs, a Korean series sits at rank 5.71 on the weeks a stablemate shares the chart and 5.21 on the weeks it is alone. The direction is the one schedulers fear. The size is half of one place out of ten.
9 August 2026
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