Every birth date here was published by the person or their agency. Each card shows the date it uses, so a wrong date is one you can see, not one that quietly changes a result.
Every chart here has six characters, not eight, because none of these people has published a birth time. We do not make one up, since a made-up time would change the chart. The compatibility result is not affected: it uses the animals of the year, month and day, not the hour. The only cost is two fewer characters when the five elements are counted.
Everyone born in Korea is charted as if born in Seoul, and this changes nothing. With no birth time, a chart is worked out at noon, and at noon every Korean city gives the same chart. We checked every birth date against six other cities, from Gangneung to Jeju, and no chart changed. People born in another country are charted in that country, because a different time zone can change the chart.
This page compares two charts and says nothing about the celebrities themselves. None of them was asked about it, and nothing here describes them as people.