Refer to http://www.italki.com/question/263269 새로운 used for describing something which make someone feel fresh. antonym is 오래된(antique,aged) 새 used for describing something which is newly made and nobody used it before. antonym is 헌(used,word out) In short, 새로운 means "fresh new" 새 means "brand new"

if you know french, the distinction is exactly parallel to "neuf" versus "nouveau". Two words that are translated into english as "new" but they are different.