Disclaimer: I'm also learning Korean, so you might want to verify with someone who actually knows what they're talking about. I've also found "for" to be the most difficult to translate. It can be translated several different ways depending on the usage. I think in this case 에 대한 does work, but 에 대한 is usually translated as "about". For example "the book about shipwrecks", where book is modified by shipwrecks. Thank for showing me 함께하다. I had never seen it used that way. Very useful, thank you.