K Culture Wire · birthdays
11 Korean actors, singers and songwriters share this birthday. Ordered by how many people opened their English Wikipedia article in the last 30 days, so the name you are most likely to know is first.
6 more people born on this day are counted but not listed — Wikidata holds no English name for them, only a Korean one, and this is an English-language site. They are inside the 17 total.
21 September is the joint 343rd busiest of 366 days for Korean star birthdays, with 17 people. It is busier than 15 of the other 365 days, and ties with 8 other days.
| Day | People born |
|---|---|
| 21 September — this day | 17 |
| The middle day of the year | 25 |
| Busiest day (1 January) (a records artefact — see below) | 48 |
| Thinnest day (12 November) | 11 |
Is that rank meaningful? Inside what an even scattering produces on its own. The rank is real, but the gap that made it is not: a day or two either way would move it a long way.
1 January is not a real peak. It is the date records fall back on when only a birth year is known, so this count includes people whose real birthday is unknown. We leave it in the table rather than quietly dropping it, but it should not be compared with the other 365 days.
We scattered the same number of birthdays evenly across 366 days 400 times, with a fixed seed (20260904) so the figure can be reproduced. On that footing a single day lands between 17 and 34 people 90% of the time. A count inside that band tells you about the calendar, not about the day.
This is a count, not a verdict. A crowded birthday does not make anyone more likely to become a star, and a thin one does not make anyone less likely. We hold birth dates only for people who already have a Wikidata entry — who reaches an encyclopaedia at all is its own filter, and we did not measure it.
These come from the same Wikidata record as the list above. Where we do not hold a figure we leave the line out rather than print a zero.
Sharing a birthday means sharing a birthday. Nothing on this page says it means anything else. We counted whether a birth year predicts who reaches a chart, and it does not — that test is here.
This is not a horoscope. We do not read birth charts and we do not say what a date means about a person. Birth dates come from Wikidata; how widely each name is read is counted from English Wikipedia.
| Name | Born | On Netflix top-10 charts | Readers, 30 days |
|---|---|---|---|
| Chen | 1992 | — | — |
| Kwon Mina | 1993 | — | — |
| Yoon Sang-hyun | 1973 | 18 Again, Pinocchio +1 | — |
| Yeo Hyun-soo | 1982 | — | — |
| Jang Yoo-sang | 1991 | — | — |
| Jeong Si-yul | 2013 | — | — |
| Jung Da-kyung | 1993 | — | — |
| Kwon Jae-hee | 1962 | — | — |
| RAM | 1987 | — | — |
| Xin Seha | 1993 | — | — |
| Han Woo-yeol | 1985 | — | — |