Native Koreans correct me if I am wrong pls. -기 위해(서) means "in order too" or "for"...: For me to go traveling (in order to go traveling) I need to save money 여행을 가기 위해서 (저는) 돈을 모아야 해요. Then there is -에게 or -한테, which would mean "for" when you give a letter or gift: I bought a present for Nyancat Nyancat 씨에게 선물을 샀어요 Nyancat 씨한테 선물을 샀어요 Finally, the word "you" is a bit funny in Korean language. For wife or husband and close friends you can use 당신, but in most other cases you would use Name + 씨 or name plus title or something. 그대 is more used in literature and songs. Good luck!

for = 위해 I bought this gift for you. = 난 너를 '위해' 이 선물을 샀어. My heart beats only for you. = 내 심장은 오직 너 만을 '위해' 뛰어. bye~