꽃잎 unknown Close-up terrestrial_plant 식물 petal annual_plant 꽃_식물 plant photo flower flowering_plant chinese_hibiscus hawaiian_hibiscus herbaceous_plant 꽃 꽃

A beautiful and unknown flower

I took this photo near to the house of a friend. But even he doesn't know the name of the flower. If somebody knows, please tell me. Its a 2 metres plant with flowers as big as almost a hand. In this case is white but it can have other colors.