How to distinguish Chinese, Korean, Japanese?

Chinese is mostly squares and corners.

Most of the time there is a small circle in Korean.

There are twists and turns in Japanese, there are not many squares, and there are not many circles. Some of them are Chinese.

English: Make the world a better place.

Chinese:  让这个世界更美好。

Korean:세상을 더 좋은 곳으로 만드십시오.

Japanese:世界をより良い場所にする。