The title of "韓國四代女團(tuán)第一神顏" (Korea's Fourth Generation Girl Group's Number One Goddess Face) is a subject of debate and varies depending on personal opinions. However, based on the provided search results, there are several members who are often mentioned as having exceptional beauty. These members include Irene from Red Velvet, Nana from After School, and Pei Zhu Xuan from Red Velvet. While some sources mention Irene as the "四代女團(tuán)神顏" (Fourth Generation Girl Group's Goddess Face), others recognize Pei Zhu Xuan as the top contender for this title. It is important to note that beauty is subjective, and different people may have different opinions on who deserves this title.