Why do Koreans call the Dragon Boat Festival in China a traditional festival in their country internationally?

According to various incomplete historical records and folk stories, Luo and Lu were destroyed by Chu in the Warring States period, and naturally these two families became prisoners of Chu. There was an alchemist in Qin called Han Zhong, looking for medicine for Qin Shihuang's alchemy. The address of his alchemy was Chu. This Han Zhong is in close contact with the Lushi and Roche families. So after the Qin Dynasty destroyed Chu, Han Zhong went into exile with Luo and Lu, which is now South Korea. If these records and circulation are accurate, today's Korea is likely to grow up with these three families. These are not groundless. The capital of Chu is in today's Hubei Province, and the names and distribution of cities in Hubei, Hunan, Shanxi and Shaanxi are very similar to those in South Korea from today's map comparison, which may be more than a coincidence. Since there are so many possibilities, the traditional festivals handed down from ancient times in South Korea today are naturally similar to those in China. Because many of them are descendants of Chu State, the story of Qu Yuan, which happened in Chu State at that time, naturally became their story, so they also celebrated the Dragon Boat Festival.