Whitening mask. According to Kezhuang's inquiry. Com, Yan value legend is a whitening mask under the banner of Jida products, which is a product of Jida. Jida Keyan is a Industry-University-Research-based joint unit of the Medical Biotechnology Research and Development Center of Jinan University, focusing on the research, development, production and sales of scientific skin care and gene beauty polypeptide freeze-dried powder.