Why are costume dramas popular in Japanese style?

This reason is more complicated. As far as I know, when Japan's postwar economy rose again, China was still very poor, and Sino-Japanese diplomatic relations were normalized at the beginning of the new century. A large number of Japanese TV dramas and cartoons flooded into China, and many people grew up in this way. The impact is certain. Hong Kong and Taiwan music and even mainland music learned a lot from it when they started.