This is an early, experimental print by Hwang, probably done after he left South Korea for Paris, where he studied printmaking at Atelier 17 in the late 1960s.
To create this abstract image Hwang used combinations of collagraph, softground etching and other techniques developed at the atelier, including his using the simultaneous method of color printing that is achieved by using the different viscosities of inks and printing in a single pass through the press.
Hwang later went on to specialize in color mezzotint, for which he is best known. South Korean printmaker moved to New York in 1970 before returning to South Korea in 2000.