In the following sentence:
이 책에서 글쓴이는 가능하면 빠른 시간 안에 사과하라고 한다.
(연세한국어 듣기와 읽기 3-1 p.68)
In one dictionary, I could not find an entry for the word (only found 글쓰다), while in another dictionary, I found 글쓴이 means "a writer".
Now I wonder if there are any such exceptions as "a verb + ㄴ/는이" to form a noun that expresses "a person to do that action", or if it is even possible to create that type of word by yourself.
For example, many Korean nouns are created by adding 자, 가, or 사 to express someone to do that action. 기자 for a reporter, 작가 for a novelist, 화가 for a painter, 의사 for a doctor. But these words originate from Chinese while ㄴ/는이 is not.
So is there any other such nouns that use ㄴ/는이 appended to a verb, or is 글쓴이 an exception?
Also, can I create a noun in such a way and make myself understood? (like 싸운이 to mean "a fighter")