Japanese
Japanese is a language spoken by more than 125 million people in Japan and the Japanese diaspora around the world. Japanese vocabulary uses a lot of kanji imported from China, such as gakumon (学問, "academic"), sekai (世界, "world"), hakasei (博士, "doctor"), which is words imported from China in the past.
Japanese is difficult to learn because the spoken and written systems are completely different. The honorific system in Japanese has developed very "progressively". Unlike most Western languages but like many Eastern languages, Japanese has a grammatical system for expressing respect and formality. Honorifics make Japanese polite, but the grammar is too complicated, making it extremely difficult to learn honorifics. Japanese nouns can be made polite by adding o- or go- as prefixes, for example, the word Tomodachi 'friends,' becomes o-Tomodachi when referring to someone's friend who has higher status or referring to Mizu "water" as o-mizu to indicate politeness.
Native speakers: 128 million
Refer to: https://en.wikipedia.org/wiki/Japanese_language