흰 and 하얀 are both adjective forms of the verbs 희다 and 하얗다, which both mean "to be white" but there is a difference. 하얗다 just means "white" without any nuance. 화장을 너무 많이 해서 얼굴이 하얘요. I've put too much make up on so my face is white. 하얀 눈 white snow 하얀(색) 테이블 a white table You can use 희다 only if white is the basical color of the thing. 흰 눈 white snow 흰 우유 white (normal) milk 흰 구름 white cloud

Both are the same, the two words are interchangeable.