As it is well known, Nichkhun and Tiffany enjoyed their date very secretly. Evidences Even before their relationship was revealed, some netizens have already found circumstantial evidences. From what I know, they have been dating for four months. Since the two have the similarity of living in the states, they started talking more and became friendly. Tiffany's real name is Hwang Mi 'Young'. In Korea, there are not a few idol stars from foreign countries.