It makes for a fun bridging the gap cultural experience when talking to Chinese people about the Chinese idioms you learn in Japanese class. Even the pronunciation is so similar (I mean, of course it is, duh).

My favorite one is 吴越同舟 or 呉越同舟 (Wú Yuè tóng zhōu) meaning people of different backgrounds finding themselves having to work together.

https://www.zdic.net/hans/%E5%90%B4%E8%B6%8A%E5%90%8C%E8%88%...

https://jisho.org/word/%E5%91%89%E8%B6%8A%E5%90%8C%E8%88%9F

If only the two countries were as close diplomatically as they are in their shared culture.