Japanese and Korean
The Japanese and Korean languages have many similarities. They share many vocabulary words borrowed from Chinese, and much of their grammar has a similar form.
Words like denwa (telephone) and jeonwa are easy for native speakers of one language to learn in the other language. Both languages use postpositions, for example in Japanese Tokyo e means "to Tokyo", just as in Korean Seoul e means "to Seoul". Both languages avoid the use of pronouns wherever possible, especially personal pronouns like "you". A person's title or a relationship term is used instead; see Pronouns in Japanese.
Both languages omit the subject when context permits. They are thus OV languages more than SOV languages.
Japanese has over 120 million native speakers. Korean has nearly 70 million.