The day pillars of 9,249 Korean entertainers — BTS land on 6 of the ten
Does any day pillar show up more often than chance among Korean entertainers — and among the most-linked of them?
Read this first — this is not a reading
A day pillar is one of four pillars, and the fourth cannot be built here: public records carry birth dates and almost never birth hours. Nothing on this page says what any pillar means for any person. The only question asked is whether the spread across the pillars is further from flat than chance would produce.
A day pillar is one of the four pillars. The hour pillar cannot be built here: public records carry birth dates and almost never birth hours.
Counting who exists is not counting who succeeded. Sitelink counts are a proxy for how widely a person is written about, not for talent, income or chart position.
People whose birth date is recorded only to the month or year were left out and counted separately, not folded in as zeroes.
The ten day stems, with the names in each
9,249 people, each placed by the day they were born. A flat spread would put 924.9 in every column. The third column is the most-linked tenth of the same people (925 of them, those with at least 14 Wikipedia editions) — the test for whether any pillar crowds the famous end.
| Day stem | All | Most-linked tenth | Best-known names in this stem |
|---|---|---|---|
| 庚 Gyeong | 984 | 106 | Lee Jung-jae, Jung Ho-yeon, Momo |
| 辛 Sin | 964 | 87 | Song Joong-ki, RM, Kim Soo-hyun |
| 甲 Gap | 949 | 93 | ROSÉ, Jisoo, Kim Seok-jin |
| 乙 Eul | 944 | 87 | V, J-Hope, Im Yoon-ah |
| 丁 Jeong | 940 | 108 | IU, Kang Seul-gi, Jimin |
| 丙 Byeong | 927 | 90 | Jungkook, Chun Jung-myung, Daniel Dae Kim |
| 癸 Gye | 914 | 89 | Yun Hyon-seok, Cho Jung-seok, BoA |
| 戊 Mu | 905 | 82 | Irene, Gong Yoo, Taeyeon |
| 壬 Im | 890 | 94 | Psy, Lee Min-ho, Jennie |
| 己 Gi | 832 | 89 | Suga, Bae Suzy, Ken Jeong |
Chi-square 17.91 against a threshold of 16.92 at nine degrees of freedom — above the line. For the most-linked tenth, 6.77 against the same threshold.
The twelve day branches
| Day branch | All | Most-linked tenth |
|---|---|---|
| 酉 Yu | 802 | 65 |
| 子 Ja | 797 | 79 |
| 午 O | 789 | 77 |
| 亥 Hae | 785 | 83 |
| 卯 Myo | 780 | 68 |
| 寅 In | 778 | 76 |
| 戌 Sul | 774 | 72 |
| 申 Sin | 767 | 79 |
| 未 Mi | 759 | 84 |
| 巳 Sa | 758 | 79 |
| 辰 Jin | 750 | 82 |
| 丑 Chuk | 710 | 81 |
Chi-square 8.8 against 19.68 at eleven degrees of freedom — below the line. Most-linked tenth, 5.05.
One of these four tests crossed the line. We are not calling it a finding
One of our four tests crossed the 0.05 line. Before treating that as a finding we tried to kill it, and we publish what we tried whether or not it worked.
| What we tried | People | Chi-square |
|---|---|---|
| Everyone | 9,249 | 17.91 |
| Administrative-looking dates dropped (01-01, 12-31, 01-15, 07-01, 03-01) | 9,091 | 17.77 |
| Born 1900–1969 | 1,491 | 15.69 |
| Born 1970–1989 | 4,173 | 16.1 |
| Born 1990–2029 | 3,585 | 8.31 |
Dates that look administrative rather than remembered (1 January and the like) were dropped. If they were driving the result, dropping them would move it.
Day stem and day branch, each for everyone and for the most-linked tenth. With four independent tests at the 0.05 level, one crossing happens by chance roughly one time in five.
So: dropping the suspicious dates does not move it, no single era crosses on its own, the most-linked tenth does not cross, and the day branch does not cross. A single marginal crossing out of four tests is what chance produces about one time in five. We publish the number, we publish everything we tried to kill it, and we do not tell you that a day stem does anything.
Two groups everyone knows, looked up one member at a time
We picked these two groups because their names are widely known, not by sampling. Members are resolved by Wikidata membership in both directions (P463 and P527), never by matching a stage name: an earlier version of this table attached BLACKPINK's Lisa to a different person born in 1980. Where an item carries no English label we fall back to an English alias and then to the Korean label, so nobody is dropped for want of a name. Only best-ranked birth dates are read, because an older low-precision statement had us report one member as undated when her date is on record to the day.
BTS — 7 of 7 members have a birth date on record to the day, and they land on 6 different day stems
| Member | Born | Day pillar | Citizenship on record |
|---|---|---|---|
| Kim Seok-jin | 1992-12-04 | 甲寅 | South Korea |
| Suga | 1993-03-09 | 己丑 | South Korea |
| J-Hope | 1994-02-18 | 乙亥 | South Korea |
| RM | 1994-09-12 | 辛丑 | South Korea |
| Jimin | 1995-10-13 | 丁丑 | South Korea |
| V | 1995-12-30 | 乙未 | South Korea |
| Jungkook | 1997-09-01 | 丙午 | South Korea |
Blackpink — 4 of 4 members have a birth date on record to the day, and they land on 3 different day stems
| Member | Born | Day pillar | Citizenship on record |
|---|---|---|---|
| Jisoo | 1995-01-03 | 甲午 | South Korea |
| Jennie | 1996-01-16 | 壬子 | South Korea |
| ROSÉ | 1997-02-11 | 甲申 | New Zealand, South Korea |
| Lisa | 1997-03-27 | 戊辰 | Thailand |
1 member here is not a South Korean citizen on the public record, so she is outside the 9,249 counted above. Shown here anyway, because dropping a member without saying so would make a group of four look like a group of three.
The ten stems, with every name in them
The tables above are the count. If you want the names, they are split into ten pages, one per day stem, ordered by how many Wikipedia editions carry an article about the person — so the name you are most likely to know comes first.
- 甲 gap — 949 names, including ROSÉ, Jisoo
- 乙 eul — 944 names, including V, J-Hope
- 丙 byeong — 927 names, including Jungkook, Chun Jung-myung
- 丁 jeong — 940 names, including IU, Jimin
- 戊 mu — 905 names, including Irene, Gong Yoo
- 己 gi — 832 names, including Suga, Bae Suzy
- 庚 gyeong — 984 names, including Lee Jung-jae, Jung Ho-yeon
- 辛 sin — 964 names, including Song Joong-ki, RM
- 壬 im — 890 names, including Psy, Jennie
- 癸 gye — 914 names, including Yun Hyon-seok, Cho Jung-seok
A page name is not a reading. The pages exist because a list of 9,249 names is not a page anyone finishes and ten pages of about nine hundred are. Sharing a day stem with IU means being born on one of the same ten kinds of day, and nothing else.
How this was counted
- Source — Wikidata (P31=Q5, P27=Q884, P106 in {actor, singer, songwriter, musician}), date of birth P569 with day precision, CC0
- Counted — 9,249 people
- Left out and counted separately — 875 people whose birth date is recorded only to the month or the year. They are not folded in as zeroes.
- Ranges we could not ask — 0. A range we could not ask is reported as unasked, never as empty.
- Thresholds — the 0.05 chi-square values, copied from a table: 16.92 at nine degrees of freedom, 19.68 at eleven. We did not compute those two numbers ourselves.
The same test on birth years, with names · The birth-year count that came out as chance · How we count
Card set — free to share
Five cards, 1080×1350. Every figure on them is in the table on this page. Take them.
What we wrote from this data
- IU and Jimin share a day stem. RM and Song Joong-ki another
We counted which of the ten day stems each of 9,249 Korean entertainers was born on. The spread runs 832 to 984, and a chi-square just crosses the usual threshold. We print that number even though it argues against us.
26 August 2026
- Day pillars for 9,249 Korean entertainers, IU and BTS in
English saju sites read one chart at a time, so nobody has a denominator. We built one: 9,249 Korean entertainers with a birth date on record to the day. One of our four tests crossed the chance line; here is what we did to kill it.
22 August 2026