South Korean television shows frequently explore its epic past, many setting the series in ancient times, but sometimes they draw from more recent history, setting K-Dramas during the tumultuous period of Japanese occupation in Korea. When historical K-Dramas are set in more ancient times, they often focus on the Joseon Dynasty, a period that spanned 505 years from 1392-1897. However, the era of Japanese occupation offers rich, dynamic stories of resilience and resistance in the face of immense struggles and hardship.

https://screenrant.com/historical-k-dramas-japanese-colonial-rule-setting/