Learn Hardcore Korean: chaek kkeute sajini isseoyo. - There is a photo at the end of the book.

The particle -에 marks a location (or time) where something exists or happens. In 책 끝에, it tells us where the photo is—at the end of the book.

Why is there no 의 in 책 끝에 (why not 책의 끝에)?

Korean often combines two nouns without the genitive 의. 책 끝 is a compound meaning book’s end. You can add 의 in more formal writing (책의 끝), but in everyday speech it’s usually omitted.

Why is 사진 followed by -이 (as 사진이)?

-이 is the subject marker for nouns ending in a consonant. It marks 사진 as the subject of the existence verb 있다 (“there is/exists”). If the noun ended in a vowel, you’d use -가 instead.

What kind of verb is 있다 and what does 있어요 mean here?

있다 is the existence (or possession) verb in Korean. 있어요 is its polite present form. In a sentence like this, it means “there is” or “there exists.” The basic pattern is [Location]에 + [Subject]이/가 + 있다.

Can we use 끝에서 instead of 끝에? What’s the difference between and ?