Hi Haejen, Try asking a Korean teacher this question or changing the language to Korean and then retype the question so that Korean teachers may answer your question.

제 모든 한국인 친구들에게, 만약 한국에서 오는 사람 곧 터키에 오고 있는 걸 안다면, 알려 주세요 와냐하면 한국에서 온 책 몇 개 필요해요 그리고 저는 지불할 거에요 Literally: To all my Korean friends, If you know a person who comes from Korea who is coming to Turkey soon, please let me know because I need some books that came from* Korean and I'll pay (for it). *When saying something or someone is from somewhere, you have to say "I came from". I'm not exactly sure if you mean "someone coming from Korea" as in someone who lived there or a native Korean. IMPORTANT NOTE: I am not Korean, I'm using my Korean ability to answer your question as best as I can. It is up to you to decide whether you want to use my answer or not. I hope this helped! ^^